How Do I Seal New Plaster before Painting?


You have to seal new plaster before painting it to limit chances of the paint losing its moisture content. This causes the paint to blister and flake off after a while. Sealing primarily means the application of a coat that is dilute enough to mix with the liquid it is mixed with.
2 Additional Answers
The reason for not painting before the wall is completely dry is that most paints will simply form an air tight skin over the wall. The moisture from the new plaster is then trapped behind this skin and cannot evaporate off. A fully plastered wall, i.e. two or even three coats of plaster, can take months to dry. There are paints on the market called Microporous Paints. These paints allow the surface of the plaster or artex to carry on breathing and evaporating while they are drying out. If you intend to put an oil based paint on the surface, such as eggshell or gloss, then the surface can be sealed using a solution of PVA adhesive. This is mixed at the same ratio. Some companies actually produce a plaster sealer.
You seal a newly plastered wall before painting by applying a coating which is diluted enough to penetrate the pores of the material. You can apply a coating of emulsion paint in the ratio of four parts paint to one part water, but if the plaster is not sucking up the liquid when applied, you need to add more water to a maximum of one part water to one part paint. Once the surface is sealed and dry, you can continue to paint normally.
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