How To Paint New Plaster

May 22nd, 2026

Painting plaster is all about good preparation by removing dust, filling holes and lightly sanding the surface. In this guide, we'll show you how to prep, mist coat and paint plaster to get the perfect finish.

What Tools Should I Use To Paint On New Plaster?

To paint on new plaster, we recommend using:

• A roller with a medium pile sleeve

• A paint brush for cutting in round the edges

• A roller tray

Step 1: Check The Plaster Is Dry

New plaster 4-6 weeks to dry depending on room temperature, ventilation, humidity levels and thickness of plaster. Plastering done in winter or a poorly ventilated room will take longer than in summer.

To tell if plaster has dried, the wall should look an even pink colour. If there’s dark spots showing, this means that there’s moisture on the wall and it’s not dry yet.

You can check dryness rather than relying on a fixed timeframe:

Colour test: dry plaster looks pale, even pink. Darker or patchy areas usually mean moisture is still present.

Plastic sheet test: tape a piece of plastic sheeting (roughly a foot square) to the wall overnight. If condensation forms underneath, or the wall looks darker where covered, it isn't ready.

Painting too early traps moisture behind the paint film and can cause blistering, flaking, or patchy absorption later.

Step 2: Preparing The New Plaster

The first step in preparing new plaster is to:

• Get rid of any dust and loose particles on the surface. The best way to do this is to use a brush or a vacuum cleaner.

• Check for any imperfections and lightly sand the surface until it’s smooth.

• Use a filler to repair any damage

Step 3: Mist Coating The Plaster

Use a contract matt paint as the product’s breathable and allows any remaining moisture to pass through the paint. You’ll then need to thin the emulsion with water and stir it thoroughly.

Typically, you'll need to dilute 70:30 to 60:40 paint to water, but always check your paint tin as different manufacturers vary.

Applying The Mist Coat To The Plaster

Make sure your roller is loaded with plenty of paint and start rolling the paint onto the wall. You don’t need to be too vigorous with the rolling action.

Don’t worry about it looking patchy as the mist coat is there to just seal the surface. You’ll see that the plaster will absorb the paint quickly.

Step 4: Applying A Top Coat

Once your mist coat has dried, you can apply a top coat. For a durable finish, we recommend Albany Scrubbable Matt for its class 1 scrub rating. Apply the first coat of paint and then leave this to dry for 4 hours. Once this is dry, apply a final coat to finish the project.

For the best finish:

• Use quality interior wall paint

• Apply thin, even coats

• Allow drying time between layers

• Work in consistent lighting to spot missed areas

Buy Decorating Materials For Preparing And Painting Plaster

Shop plaster primers and find everything you need to prepare and paint plaster at your local Brewers store.

FAQs

How Does Preparing The Plaster Impact The Finish?

Preparing and painting your plaster can make a huge difference to the final finish of a surface so it’s important to get it right.

By allowing the plaster to dry properly, sealing it with a mist coat and applying paint carefully, you can achieve a clean, durable result that looks professionally finished.

Can I Use Any Paint For The Mist Coat?

We recommend using a contract matt paint as the product’s breathable and allows any remaining moisture to pass through the paint. Avoid using vinyl emulsions and vinyl silk or satin finishes as they're less breathable and can seal the surface too soon.

How Many Mist Coats Do I Need?

One mist coat is enough for most walls. One mist coat lets the plaster absorb the diluted paint and creates a stable base for a topcoat. You may need a second coat if:

The plaster is unusually porous or patchy
You're covering a very dark surface with a much lighter topcoat
After the first mist coat and topcoat, you can still see uneven sheen or patchiness

Do I Need To Do Anything Differently For Old, Previously Painted Plaster?

No mist coat is needed. Clean the surface, fill any damage, sand, and paint as normal — a coat of primer is only necessary if you're changing to a very different colour or the surface has become porous.