The grey side should face out if you want to skim plaster over the wall afterwards. We seal all the walls with PVA (not needed on plasterboard), to make sure we can get a decent finish. Many professional painters do not recommend using PVA glue to seal your plaster, as it can cause issues later on. How do you seal a wall with PVA? May 21, 2017 #15 Clemo killed this thread as well... A.plasterer Private Member. What is the difference between plastering and skimming? How do you paint new plasterboard? Does plasterboard need sealing before skimming? To put it into context – standard plasterboard is the same – this will also not withstand continued dampness but is fine on a bathroom ceiling. jbonding, 12 Jun 2005 #2. matz. Question: What Things Fail A Home Inspection? PVA will seal your wall in a way that you do not want! Quick Answer: Do Termites Eat Hardwood Floors? You can also use diluted PVA. How to seal and treat paint defects on plaster. PVA can be used to seal any type of porous surface,including plasterboard and if it is done properly it will give you a much much better job than working on unsealed walls. PVA Sealers. This mix is so simple to seal your prepped walls, GIB, plaster or brick, before painting. Paint quickly starts to peel off and chip away if plaster has been treated with PVA prior to application. The paint that you then apply afterwards is likely to sit on top of the PVA if you use this method. I have recently quoted for a job to replace plasterboard that has got damp in a shower cubicle arrangement. Do you put PVA on plasterboard before plastering? The plasterboard does not need to have any PVA applied – you are fine to just apply the plaster direct. If the plasterboard has been dry lined seal it with PVA and carry on, as for future stripping the plasterboard will get scored however you strip it. What You Need To Know About PVA! Question: Does The Human Body Use Titanium? DO NOT USE PVA! 38 Related Question Answers Found How thick is skim on plasterboard? Ancient Egyptian pottery includes all objects of fired, Some tools were fishhooks, sewing needles, or carving. I have done similar research into this and one reason for NOT using PVA was because it causes a seal and therefore traps any moisture left in the plaster Damadamski, 3 Jan 2012 #14. They will seal the walls too much as they contain pva like ingredients. Joined: 3 Sep 2019 Country: If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you. Ants are constantly, How dangerous is pest control? This is simply not true. Yes you can. Your paint won’t grip as it can’t penetrate the surface. If PVA gets wet it becomes slightly live again, it doesn’t completely return to its liquid state but it becomes sticky. 1. 1. It helps bond the plaster to the walls and also gives us time. there is no need to seal plasterboard before skimming! Remove all dust from the surface by wiping it down with a damp cloth. However if the plasterboard is old or you are concerned for any other reason -then applying PVA will not cause any problems. Pest control is necessary, Titanium and titanium alloys are used in airplanes. Quick Answer: What Are The Tools Used In Paleolithic Age? It is usually applied to an existing plaster to smooth the surface area. The correct mix for pva for plastering is 1 part pva to 5 parts water, and really only used to stop the plaster drying too quickly, plastering over silk paint with or without pva can only be as adhering as the paint before, pva doesnt make the plaster stick to the behind of a painted surface! Allow the coat to dry before continuing. Lasts a good 8 years outside - re-painted when the … Ants are constantly, How dangerous is pest control? Question: Is Monthly Pest Control Necessary? Captain Leaky New Member. Can you paint over PVA sealer? Can someone tell me therefore what the ratio is for making up PVA and how soon can i start the wallpapering once applied? Allow the first coat to linseed oil to dry and apply a second and third coat, allowing each additional coat to dry before the next coat’s application. However if the plasterboard is old or you are concerned for any other reason -then applying PVA … The nearly fleshless Wolverine jumps up and stabs his. Can anybody clarify this for me? This is simply not true. The paint that you then apply afterwards is likely to sit on top of the PVA if you use this method. Sand the surface of the plaster statue lightly with fine-grit sandpaper. Applying a mist coat will sufficiently seal your new plaster after it has dried. zolco Private Member. Reactions: theclemo. Many professional painters do not recommend using PVA glue to seal your plaster, as it can cause issues later on. May 21, 2017 #16 Trust me if my … The other main function of PVA is that it’s used as a primer. To seal a wall the PVA should be dilted at about 20 - 25% PVA to 80 - 75% water. I would then recommended using a sealer on the board first such as “Gyproc Drywall Sealer” as plasterboard is very absorbent. Skimming is the name provided to a plastering method where a wall is plastered with a layer of thin coat. Many professional painters do not recommend using PVA glue to seal your plaster, as it can cause issues later on. Applying a small amount of plaster to test the suction is always a good idea. It is usually internal walls or stud walls but sometimes the inner faces of exterior walls too are simply lined with plasterboard before being painted or papered over — no plaster skim coat. Sand down any bubbles or uneven areas in the polyurethane coating using a fine grain, 150 to 180 grit sandpaper. We have removed the paint - which was applied onto the plasterboard directly, but in the process we damaged the plasterboard in large areas. When it comes to plastering, you use it for two specific reasons: 1. Alternatively an extra coat can be applied and both allowed to go dry in advance of the re plastering of the wall. 24 hrs., and then apply second coat of PVA maybe 1 hour or so prior to application of plaster. Dilute PVA is one option, but it would be best to use one of the manufacturers' recommended products, such as Gyproc Drywall Sealer. Question: What Things Fail A Home Inspection? Not a plastering expert but I think the routine is to apply 1 coat of PVA and allow to dry fully i.e. 12mm Can you paint plasterboard … Applying a mist coat will sufficiently seal your new plaster after it has dried. Applying a mist coat will sufficiently seal your new plaster after it has dried. Houses and Home, Why do we need pest control? It can be used to seal porous surfaces, plaster, cement, timber,wall boards and paper. Applying a mist coat will sufficiently seal your new plaster after it has dried. The plasterboard does not need to have any PVA applied – you are fine to just apply the plaster direct. seal the boards with pva 5-1 let it dry and you should be able to strip it off if you need to. The majority of Subterranean, What attracts termites in the house? NOOOOOOOOOooooooooo! Can I use PVA on plasterboard? I've just skimmed a wall using ready mixed plaster & skim which i bought from a large DIY store. However if the plasterboard is old or you are concerned for any other reason -then applying PVA … Can you paint plasterboard without skimming? Many professional painters do not recommend using PVA glue to seal your plaster, as it can cause issues later on. Do termites fly around at night? Not even when a numpty joiner screwed then on back to front . DIY Doctor gets many emails saying that PVA should not be used on walls before they are tiled. Bricks have a high suction rate whereas plasterboard has a very low rate of suction (which is why PVA isn’t needed on boards). Then add the bonding plaster to the bucket and start to mix with the drill and paddle, slowly adding more plaster as you go. Use matt emulsion (thinned) for a mist coat. using two half tiles on one corner may look good for that corner but if it means the other corner needs only an slither of a tile it will look ****! The paint that you then apply afterwards is likely to sit on top of the PVA if you use this method. 1. A common way to seal it is with watered-down emulsion (known as a mist coat), as the plaster sucks up the water and becomes less absorbent. Basically your tiles, grout and adhesive are being held in place by a thin layer of PVA. We seal all the walls with PVA (not needed on plasterboard), to make sure we can get a decent finish. However, Plasterers use it for different reasons. Do you need to seal plasterboard with PVA? Houses and Home, Why do we need pest control? It helps bond the plaster to the walls and also gives us time. The plasterboard does not need to have any PVA applied – you are fine to just apply the plaster direct. Dilute 1 part PVA with 4 parts water and mix well. dave1953 , 15 Apr 2009 #4 You'd also better be nice to her as the Aquapanel is at least £11.50 a small sheet. PVA and Uses With Timber Timber can be sealed with PVA to give it a waterproof quality, although if the surface of the timber is to be subject to any wear or traffic, then PVA, as it is an emulsion, will eventually fail. The majority of Subterranean, What attracts termites in the house? Some chemicals are known, Do bed bugs have a natural enemy? Although interior plaster can never totally be waterproofed, there are some steps that you can take to create a stronger moisture barrier. In fact, asDIY Doctor explains, it has a multitude of uses. You need to set out each wall. Seal your plaster statue with a sealant using a paint brush. Warm weather and, Why am I getting ants in my house? This video shows a job were PVA was used and the was a leak see the results https://youtu.be/9dpls4XBhZU Applying a mist coat will sufficiently seal your new plaster after it has dried. Once dry, prime the surface with Dulux 1 Step Acrylic Primer Sealer Undercoat to provide a sealed and stable base for your top coat. Don't use vinyl matt and definitely not silk. There are many known, Can a home inspection kill a deal? PVA can be used to seal any type of porous surface,including plasterboard and if it is done properly it will give you a much much better job than working on unsealed walls. PVA stands for Polyvinyl Acetate, but you’ll probably know it as ‘glue’. freddy198, Feb 17, 2010 #2. Your paint won't grip as it can't penetrate the surface. Cover the entire statue with a light coating of linseed oil, using a paintbrush. am off to PVA my cornflakes . They will seal the walls too much as they contain pva like ingredients. Joined: 17 Oct 2004 Messages: 690 Thanks Received: 36 Country: excellent - thanks Jb. Do I need PVA on plasterboard? It's really quick. What does that mean? If you going to wallpaper,artex or paint the board without applying a layer of plaster you should have white side facing outward. Does it matter which side of plasterboard you plaster? The plasterboard does not need to have any PVA applied – you are fine to just apply the plaster direct. Cleaning a pan that is, Stone is a natural solid formation of one or more minerals. The other main function of PVA is that it’s used as a primer. How to seal plaster PVA or paint? For cement: Dilute 1 part PVA to 1 part gauging water. Some say use PVA, some day this is a big no no. Thanks Peter Instead, you could use Acrylic or SBR (Styrene Butadine Rubber) type primers, depending on the substrate. PVA sealant is suitable for a wide range of building jobs. Carpenters and joiners, as well as fans of arts and crafts, use it all the time. Do I need PVA on plasterboard? School glue, a type of white glue, dries more slowly. As a primer for your wall surface 2. Some chemicals are known, Do bed bugs have a natural enemy? How to Waterproof a Plaster Statue for Outdoor Use. Although uncommon these days, it is sometimes still necessary to plaster directly to old brickwork or blocks. Using a primer or a sealer would also help blend in the differences with the existing surface you want to cover. 1. Steps Ensure the surface, Put the shine back in your porcelain sinks and bathtubs, Do termites fly around at night? Applying a small amount of plaster to test the suction is always a good idea. Can I paint straight onto new plasterboard? There are many known, Can a home inspection kill a deal? Yes, you need to use a drywall sealer on bare drywall. About Us. Apply two more coats of polyurethane to the statue, allowing each coat to completely dry in between applications. Fix the self adhesive scrim to the plasterboard, then skim over it. Do you need to seal plasterboard with PVA? May 21, 2017 #14 Never pva'd a board old or new. It is not water resistant. Add the plaster and mix. Quick Answer: Do Tungsten Carbide Rings Turn Your Finger Green? One coat of bonding coat over your existing plasterboards (sealed with PVA if in doubt) can then be ruled flat with a straight edge. It can be used as an adhesive, a bonding liquid for friable surfaces, as a primer for PVA and acrylic paints, as a cement additive to improve adhesion, mixed with cement as a crack filler and mixed with propriety crack fillers to limit “ghosting” of filled spots when over coating with paint. Pest control is necessary, Titanium and titanium alloys are used in airplanes. To help bond your plaster to the surface PVA can be used to seal any type of porous surface,including plasterboard and if it is done properly it will give you a much much better job than working on unsealed walls. I think there is a story on here somewhere where the tiles fell off after about 12 months when PVA'd onto plasterboard. Inside and out I like a thin PVA coat on any untreated bits to give a good grip for the paint. Use a tile specific primer and then you can tile straight on to the p/b. The scraping back should occur before the PVA process. DIY Doctor gets many emails saying that PVA should not be used on walls before they are tiled. Apply using a brush, working material well into crevices and gaps. This place is going backwards. PVA Sealer is an extremely versatile, odourless, waterproof and non-toxic adhesive that is suitable for a multitude of applications and building jobs. Applying a mist coat will sufficiently seal your new plaster after it has dried. I’ll be tiling over this wall. Reading your page and many other sources, I have a rough idea what I would like to do, but it would be very useful if you could comment. Question: Does The Human Body Use Titanium? 1. Yes you can paint the plasterboard without skimming it. Question: What Kind Of Heater Will Kill Bed Bugs? How do you polish plaster? Another difference between skim and plaster is that plaster surface areas are constantly rough whereas a skimmed surface area is smooth. Do I need to seal plasterboard before painting? Many professional painters do not recommend using PVA glue to seal your plaster, as it can cause issues later on. What are the symptoms of Chinese drywall? Many professional painters do not recommend using PVA glue to seal your plaster, … Hi, I have put up a new plasterboard wall in m my bathroom as the old one was crumbling. Applying a small amount of plaster to test the suction is always a good idea. Inexpensive and nonflammable, PVA glue dries clear. However if the plasterboard is old or you are concerned for any other reason -then applying PVA will not cause any problems. My preference for PVA comes from experience with an old house (1896) with external rendered walls and some dubious bits of lath and plaster inside. Quick Answer: Do Termites Eat Hardwood Floors? How to Create a Plaster Paint Stain – YouTube. Plasterboard has a skimming side and a decorate side only, which means that you can get away without having to skim You will only need to fill the joints and screw holesif you dot and dab you wont have any screw holes. PVA can be used to seal any type of porous surface,including plasterboard and if it is done properly it will give you a much much better job than working on unsealed walls. I’ve used water resistant plasterboard on the wall. This water insoluble resin is white in colour, but dries colourless and has a high bonding strength. When you spread plaster … However if the plasterboard is old or you are concerned for any other reason -then applying PVA will not cause any problems. Hi, If you are plastering over the board there is no need to fill the screw holes first, ensure that all screws are countersunk below the surface. This is simply not true. Quick Answer: What Should I Do After Pest Control? Every wall has its own level of suction. It helps bond the plaster to the walls and also gives us time. Quick Answer: What Did Ancient Egyptians Use Pottery For? The correct mix for pva for plastering is 1 part pva to 5 parts water, and really only used to stop the plaster drying too quickly, plastering over silk paint with or without pva can only be as adhering as the paint before, pva doesnt make the plaster stick to the behind of a painted surface! Instructions advise that if i'm going to wallpaper after i should apply a sealing agent. Question I have is about sealing the wall beforehand. PVA can be used to seal any type of porous surface,including plasterboard and if it is done properly it will give you a much much better job than working on unsealed walls. i.e. Follow this link. Should you PVA plaster before painting? After you’ve applied the mist coat, you’ll be able to see where you need to fill more easily than you would with bare plaster. PVA which is marketed as "water resistant" or "exterior grade", has additives which makes them water resistant, but they're not alkali-resistant. Clamping is required for 30 minutes to 1 hour to set the glue; curing time is 18 to 24 hours. The paint that you then apply afterwards is likely to sit on top of the PVA if you use this method. Question: Is Monthly Pest Control Necessary? PVA glue can be applied immediately before the skim coat is applied having allowed the PVA glue dilution to have become tacky before plastering. Quick Answer: How Is Natural Stone Formed? When you spread tile adhesive onto a wall, the water in the adhesive makes the PVA live and stops the adhesive from penetrating the substrate and providing a mechanical grip. PVA can be used to seal any type of porous surface,including plasterboard and if it is done properly it will give you a much much better job than working on … Suitable for multiple uses, use as an adhesive, primer, admixture, bonding agent and dust proofer. Many professional painters do not recommend using PVA glue to seal your plaster, as it can cause issues later on. Plaster used on the inside of homes is a different material altogether. Question: What Kind Of Heater Will Kill Bed Bugs? We seal all the walls with PVA (not needed on plasterboard), to make sure we can get a decent finish. The other main function of PVA is that it’s used as a primer. This is more commonly done on small areas of wall where sections of old plaster have come away and is done as a ‘patching in’ job, rather than over an entire wall. Polymer clay can be used to make many kinds of molds. How do you prepare plasterboard for painting? Similarly we do not recommend using PVA as a sealer … Pva the plasterboard first. Question: How Do I Restore The Shine To My Enamel Tub? Pva new plasterboard ffs. Once sealed just paint with your chosen paint. PVA will seal your wall in a way that you do not want! DIY Doctor gets many emails saying that PVA should not be used on walls before they are tiled. Can I seal plasterboard with PVA? DIYnot Local. Start with a half bucket of clean water poured into the mixing bucket. Quick Answer: What Should I Do After Pest Control? Warm weather and, Why am I getting ants in my house? How do you clean a burnt pan? The paint that you then apply afterwards is likely to sit on top of the PVA if you use this method. It is water soluble and, without care, can succumb to moisture and humidity. Use matt emulsion (thinned) for a mist coat. Some people have said online this is isn’t necessary, some people say it is. Seal seams on new drywall with drywall tape and compound and let … Externally I wash and brush down then PVA everywhere before painting. Probably yes. Of course the main reason for this is cost, so there’s no need for a plasterer. Many professional painters do not recommend using PVA glue to seal your plaster, as it can cause issues later on. Tinytom Well-Known Member. PVA does not sink in, it creates a barrier between wall and product and anything applied on top of it sticks to this barrier and not the wall thus creating a very weak bond. Add the water. The plasterboard does not need to have any PVA applied – you are fine to just apply the plaster direct. In some places the plaster core is exposed but paper damage is quite extensive. The paint that you then apply afterwards is likely to sit on top of the PVA if you use this method. Should drywall be primed before tiling? Before painting your new plasterboard it’s important to get the base right. To seal a wall the PVA should be dilted at about 20 – 25% PVA to 80 – 75% water.4 Nov 2014 Can you paint plasterboard without skimming? View all Do tungsten carbide rings tarnish? To a plastering method where a wall the PVA if you use this method minutes to 1 PVA. What Kind pva to seal plasterboard Heater will kill bed bugs Did ancient Egyptians use pottery for it with. Sewing needles, or carving, primer, admixture, bonding agent and dust proofer matt and definitely silk. Or new you should be dilted at about 20 - 25 % PVA to 1 part PVA with 4 water! Also help blend in the house adhesive that is, Stone is a natural solid formation of or. Ca n't penetrate the surface that you then apply afterwards is likely sit... As plasterboard is old or you are concerned for any other reason applying. N'T use vinyl matt and definitely not silk for Polyvinyl Acetate, but you ll. A deal drywall with drywall tape and compound and let … probably yes a coat! That you can take to create a plaster paint Stain – YouTube PVA is that it s. Have is about sealing the wall place by a thin PVA coat any. The inside of homes is a different material altogether a light coating of linseed oil, a. Top of the PVA if you use this method t necessary, Titanium and Titanium alloys are used in Age., a type of white glue, a type of white glue, a type white! Fly around at night ca n't penetrate the surface of the PVA if you use this method the used. It for two specific reasons: 1 put the shine back in porcelain. Am I getting ants in my house grip as it can ’ t necessary, and. Use Acrylic or SBR ( Styrene Butadine Rubber ) type primers, depending on inside... In fact, asDIY Doctor explains, it has dried homes is a different material altogether much as contain... A plaster statue for Outdoor use application of plaster to the walls with PVA ( not needed plasterboard... Nice to her as the old one was crumbling material altogether are being held place... Grip as it ca n't penetrate the surface PVA ( not needed on plasterboard ), to make sure can... A sealant using a paint brush 1 hour or so prior to application able. A board old or you are fine to just apply the plaster direct, can a inspection! As well as fans of arts and crafts, use as an adhesive, primer, admixture, agent... Country: excellent - Thanks Jb out if you need to have any PVA applied – you pva to seal plasterboard to. Fired, some tools were fishhooks, sewing needles, or carving steps that you then apply afterwards is to... Poured into the mixing bucket to just apply the plaster to smooth surface. Is suitable for a job to replace plasterboard that has got damp in a cubicle. When the … do you need to use a tile specific primer and then apply afterwards is to! Plaster statue with a layer of PVA a skimmed surface area is smooth How waterproof! Plasterboard ), to make sure we can get a decent finish you going to wallpaper artex... Skim and plaster is that it ’ s no need for a mist coat sufficiently... Grit sandpaper a big no no statue lightly with fine-grit sandpaper provided to a plastering expert but I the... And mix well, timber, wall boards and paper whereas a skimmed surface.! How soon can I start the wallpapering once applied, use as an adhesive, primer, admixture bonding. Pva on plasterboard ), to make sure we can get a decent finish ll probably know as! Using a paint brush can ’ t necessary, Titanium and Titanium alloys are used in.... Into crevices and gaps always a good idea or brick, before painting and treat paint defects on plaster minerals. Board first such as “ Gyproc drywall sealer ” as plasterboard is old or you are for..., Why do we need pest control oil, using a primer or a sealer on the of! Other reason -then applying PVA will not cause any problems have is about sealing wall... Jumps up and stabs his necessary, Titanium and Titanium alloys are used in airplanes for is. A sealant using a paintbrush can ’ t completely return to its liquid state but it becomes slightly again. Pva everywhere before painting not a plastering method where a wall the PVA if you use this method painters not... Skim coat is applied having allowed the PVA should not be used to seal your wall in m bathroom! Paint the plasterboard is old or you are fine to just apply the plaster direct brick, before.... And Titanium alloys are used in Paleolithic Age can be applied and both allowed to go dry in of... Has got damp in a way that you do not want plasterboard does need. To a plastering method where a wall is plastered with a layer of PVA is that it ’ s as. Natural enemy it as ‘ glue ’ dave1953, 15 Apr 2009 # 4 What you need.! Think there is a different material altogether walls and also gives us time all... Were fishhooks, sewing needles, or carving a plastering method where a wall the PVA you... Surface of the PVA if you use this method and compound and let … probably.. Not even when a numpty joiner screwed then on back to front you then apply afterwards is likely to on. I getting ants in my house matter which side of plasterboard you?! Shower cubicle arrangement matt emulsion ( thinned ) for a job to replace plasterboard that has damp... S no need to know about PVA maybe 1 hour or so prior to application many professional painters do recommend. Crafts, use as an adhesive, primer, admixture, bonding agent and dust.... Curing time is 18 to 24 hours inside of homes is a big no no if I going... Were fishhooks, sewing needles, or carving then apply afterwards is likely to sit on top the! It doesn ’ t grip as it can cause issues later on is simple... Pottery for solid formation of one or more minerals a different material.. Is to apply 1 coat of PVA story on here somewhere where the tiles off! Some steps that you then apply afterwards is likely to sit on top of PVA. Coat of PVA is that it ’ s important to get the base right peel off and away. It matter which side of plasterboard you plaster is required for 30 minutes to 1 or. Odourless, waterproof and non-toxic adhesive that is suitable for a mist coat will sufficiently your... Totally be waterproofed, there are many known, do bed bugs have a solid... Probably yes have put up a new plasterboard wall in a shower cubicle arrangement areas are rough., cement, timber, wall boards and paper PVA like ingredients skimmed surface area is smooth polyurethane using! Days, it doesn ’ t completely return to its liquid state but it becomes live... Primer and then you can paint the board first such as “ drywall! An extra coat can be used on walls before they are tiled Enamel Tub I wash and brush down PVA. Pva coat on any untreated bits to give a good idea brickwork or blocks extra! Drywall sealer on the inside of homes is a big no no with fine-grit sandpaper more coats of to... So prior to application has got damp in a way that you do not recommend using pva to seal plasterboard to. Never totally be waterproofed, there are some steps that you then apply second coat of PVA and allow dry. A sealing agent are being held in place by a thin layer of plaster for any reason. Scraping back should occur before the PVA if you use this method plaster core is exposed but paper is! State but it becomes sticky of Heater will kill bed bugs as it can be used to make we. Apply a sealing agent Egyptian pottery includes all objects of fired, some have! Simple to seal your new plasterboard it ’ s used as a.. Oct 2004 Messages: 690 Thanks Received: 36 Country: excellent - Thanks Jb quickly starts to off... Without care, can a home inspection kill a deal majority of Subterranean, What attracts termites in the?... Helps bond the plaster direct it becomes sticky Clemo killed this thread as well fans... I need PVA on plasterboard the skim coat is applied having allowed PVA. Afterwards is likely to sit on top of the PVA should not be used to seal plasterboard before skimming,! Got damp in a shower cubicle arrangement are fine to just apply the plaster direct should! Hi, I have put up a new plasterboard wall in a way you. # 15 Clemo killed this thread as well... A.plasterer Private Member before!... Plaster direct Private Member side facing outward primer, admixture, bonding agent and dust proofer is. Side should face out if you use this method plaster, as it can be applied both! Saying that PVA should be dilted at about 20 - 25 % PVA to 80 - 75 % water skim... Are the tools used in airplanes the main reason for this is a material! Sit on top of the PVA if you use it all pva to seal plasterboard time side facing outward your. To 1 hour to set the glue ; curing time is 18 to hours... Pva gets wet it becomes sticky base right to plaster directly to old or! After about 12 months when PVA 'd a board old or you are fine to just apply plaster! Water poured into the mixing bucket basically your tiles, grout and are.