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Plasterboard only — Cover the joints between boards with tape if plastering onto freshly erected plasterboard. PVA sealer is an extremely versatile, odourless, waterproof and non-toxic adhesive that is suitable for a multitude of tasks and requirements.
Moisture can be a real problem on concrete floors as it tends to absorb any moisture that it comes in contact with even with a coat of paint which will cause the paint to chip and crack. You may need to be creative in some cases, as the carpenter’s daughter did when plastering a wall with chased cables. It creates a barrier between the concrete which protects and allows you to easily apply a coat of enamel or epoxy-based paint as a finishing coat if you wish to.
For external use we recommend using SBR Bond which is much stronger and also stable in Freeze-Thaw conditions. If the PVA is dry, the surface will not be able to "suck up" any of the moisture in the mix and it will take longer to dry. I know from years of plastering experience that PVA is the secret ingredient for professionally plastered walls. PVA is used to coat extremely absorbent surfaces before the application of a finish which will dry out too quickly to work on if it were applied direct.
An important point to make is If the surface you are working on is external and likely to be washed with rain regularly, PVA is not the best product to use.Have a look at the final job and if there are patches missing or it seems like it didn’t take properly then apply a second sealer coat of PVA and wait for it to dry. Similarly we do not recommend using PVA as a sealer on walls that are to be over painted with emulsion paints. We have sealed concrete floors with PVA before with no issues but it’s a debated topic among DIYs and tradesmen. Preparation is always the most important step when tackling any DIY job so make sure you have all the tools needed.
Advice on PVA Adhesive uses and properties including sealing timber, sealing plaster, waterproofing plaster, render and mortar and as a wood glue for DIY and joinery. We send out our Facebook Group link and Page through our newsletter along with some great home DIY content and projects. You can find PVA in the likes of latex acrylic paint and drywall primer in addition to concrete floor sealers. PVA can simply be painted onto any surface, but as it is water based and needs to be absorbed, it will not stick two non–absorbent surfaces together. 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.Pro Tip: During the drying process, there’s a time when the PVA starts to feel very sticky — this is the perfect time to begin plastering. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Concrete sealers combat this problem by essentially sealing the concrete from moisture and locking in the crumbly surface of the concrete. It won’t take long but it’s best to leave it overnight so leave at least 12hours but it’s best to leave about 24 hours to ensure that all the sealer has completely dried into the concrete.
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