How to paint new plaster: preparation, priming and painting

Freshly plastered walls offer a wonderful opportunity to start with a clean slate, but painting them requires a little more preparation than decorating an existing surface.

New plaster is highly absorbent, and applying paint before the surface is ready can result in uneven coverage, patchy colour or poor adhesion. The right preparation and primer will make all the difference to the finished result.

Whether you’re decorating newly plastered walls or restoring a period property, here’s how to prepare and paint new plaster using Edward Bulmer Natural Paint.

1. Identify your plaster

Before reaching for a paintbrush, it’s important to know what type of plaster you’re working with.

Gypsum plaster is commonly used in modern interiors and is often recognisable by its pink colour. Once dry, it provides a smooth surface for decorating, although its absorbency can vary depending on how it has been applied and finished.

Lime plaster is traditionally used in older buildings, particularly those with solid masonry walls. Its vapour permeability allows moisture to move through the building fabric, making it important to choose compatible, breathable finishes.

Both types require appropriate preparation, but their drying times and priming requirements can differ.

2. Allow the plaster to dry thoroughly

One of the most important rules when painting new plaster is to resist the temptation to start too soon.

Fresh gypsum plaster generally becomes lighter and more uniform in colour as it dries. Darker patches may indicate that moisture is still present.

Lime plaster requires particular care, as it needs time not only to dry but also to carbonate and cure. The appropriate waiting period depends on the plaster system, its thickness and the surrounding conditions.

Always follow the plaster manufacturer’s guidance and make sure the surface is sufficiently dry and ready for decoration before applying any primer or paint.

Painting too early can compromise adhesion and the appearance of the finished surface.

3. Prepare the surface

Once the plaster is ready, check that the surface is clean, sound and free from dust, grease or loose material.

New gypsum plaster can sometimes develop a very smooth, polished surface, particularly where it has been heavily trowelled. This may affect how evenly the primer is absorbed.

Where appropriate, lightly abrade excessively polished areas to create a more consistent surface, taking care not to damage the plaster. Remove all dust before continuing.

For lime plaster, preparation should follow the plaster system’s specific guidance. Avoid unnecessary sanding or treatments that could damage the surface.

4. Prime before painting

New plaster is highly absorbent, which means applying emulsion directly can cause the surface to draw moisture and binder from the paint too quickly.

This may lead to uneven coverage and make it harder to achieve a consistent finish.

At Edward Bulmer Natural Paint, we recommend using a suitable primer to regulate absorbency and prepare the surface for our natural emulsion.

Plaster Primer

Our Plaster Primer is designed for absorbent or unevenly absorbent wall and ceiling surfaces, including suitable gypsum and lime plaster.

It helps create a more consistent base for subsequent coats of natural emulsion, improving the application and appearance of the finished paint.

For new plaster, our original guidance recommends diluting Plaster Primer 50:50, although you should always follow the current product instructions for your particular surface.

Grip Coat

Where a wall contains a mixture of surfaces, extensive filling or areas with differing levels of absorbency, our Grip Coat may be the more appropriate choice.

Its finely textured formulation helps provide a suitable surface for natural wall and ceiling paint, particularly where adhesion or substrate consistency needs additional attention.

Choosing the right primer is especially important with natural paint, so if you’re unsure which product to use, we’d recommend checking with our team before starting.

5. Apply your natural emulsion

Once the primer has dried according to the product instructions, you’re ready to paint.

Our natural emulsion is made with a plant-based binder and earth and mineral pigments, offering excellent opacity and a beautiful, breathable finish.

For the best results:

• Stir the paint thoroughly before and during use to ensure an even consistency.
• Use good-quality brushes and rollers suited to the surface you’re painting.
• Apply an even, generous coat, working systematically across the wall.
• Maintain a wet edge to help avoid visible joins and uneven coverage.
• Allow each coat to dry fully before applying the next.

Two coats will often provide a satisfactory finish over a properly prepared surface, although additional coats may be required depending on the plaster, colour and application.

This is particularly worth bearing in mind when painting pale colours over pink gypsum plaster.

6. Clean and care for your equipment

Once you’ve finished painting, remove as much excess paint as possible from your brushes and rollers before washing them.

Use warm, soapy water where appropriate and follow the product’s cleaning instructions. Avoid allowing paint or paint-contaminated wash water to enter drains, waterways or soil.

Store any usable leftover paint in a properly sealed container, following the manufacturer’s storage recommendations. Unwanted paint should be disposed of in accordance with local waste guidance.

Taking care of your equipment will help it last longer and reduce unnecessary waste on future decorating projects.

Beautiful results begin with good preparation

Painting new plaster doesn’t need to be complicated, but taking the time to identify the surface, allow it to dry and choose the right primer is essential.

With careful preparation, Edward Bulmer Natural Paint can provide a durable, richly coloured finish that works with the character of your walls, whether you’re decorating a contemporary interior or restoring a traditional building.

For more detailed advice, explore our practical painting guidance or contact our team for help choosing the right primer and finish for your project.