How to paint on new plaster

A straightforward guide to getting the finish right, first time.

New plaster is one of the most common causes of disappointing results. Not because the paint is wrong, but because fresh plaster is extremely porous. Skip the right preparation steps and even premium paint will soak straight in, leaving uneven coverage and wasted product. Follow this guide and you'll get a finish that looks as good as it should.

01. Let the plaster dry fully

This is the step most people rush, and it causes the most problems. Fresh plaster needs to be completely dry before you apply anything to it. Look for a consistent, pale pink or light grey colour across the entire wall with no dark damp patches. As a guide, a skim coat typically needs at least a week. Thicker applications can take two to four weeks depending on temperature and ventilation.

How to check: tape a small piece of plastic sheet to the wall and leave it overnight. If condensation forms underneath, it's not ready. Good airflow speeds drying. Open windows where possible, but avoid direct heat which can cause cracking.

02. Lightly sand and dust down

If your plasterer has left a smooth, uniform finish you can skip the sanding. If there are any small bumps, splash marks or rough patches, lightly sand these back. Once done, wipe the whole wall down with a dry or barely damp cloth to remove any dust. A clean surface is essential for good adhesion.

Avoid PVA: A common mistake is sealing new plaster with PVA before painting. Don't. PVA creates a different chemistry to your paint layers and can cause peeling. A mist coat is always the right approach.

03. Apply a mist coat

A mist coat is a diluted emulsion that soaks into the plaster and seals its surface, giving your topcoats something to properly bond to. Mix your chosen paint with water at a ratio of around 70% paint to 30% water. On very porous plaster you can go closer to 50/50. The consistency should resemble thin cream.

Apply with a roller for large areas and a brush for edges and corners. It will look patchy and that is completely normal. It is a sealer, not a finished coat. One heavier mist coat is usually sufficient, but on very porous plaster two lighter mist coats can give better results than one heavy one.

Use a similar colour to your topcoat for the mist coat as it reduces the number of topcoats needed. Allow to dry fully, usually around 24 hours, before moving on.

04. Apply your first topcoat

Once the mist coat is fully dry, apply your first full topcoat. Add 5 to 10% water to this first coat to help it bind evenly to the sealed surface. This is particularly useful on new plaster where absorption can still vary slightly across the wall. Apply in thin, even passes and allow to dry completely before the second coat.

05. Apply your second topcoat

Your second coat goes on neat with no dilution needed. This is where the depth and richness of the colour really comes through. Allow each coat to dry fully between applications. Two full topcoats over a properly mist-coated wall is the standard for a professional, lasting finish.

Coverage: how we compare

On a properly prepared, sealed surface our paint delivers 16 sqm per litre, ahead of every major premium brand.

On a properly prepared, sealed surface our paint delivers 16 sqm per litre, ahead of every major premium brand.