How to paint freshly plastered walls (without ruining the finish)
When it comes to creating a beautifully finished interior, fresh plaster provides the perfect blank canvas – but only if it’s treated with a little patience and care. If you’ve just had your walls plastered, it can be tempting to reach straight for the paint roller – especially when you have some fabulous Zhoosh Paints ready to brighten your room!
But pause for just a moment (remember – great decorating is 'slow decorating'!).
Painting newly plastered walls too soon can lead to bubbling, flaking, and patchy finishes – issues no one wants to see on freshly transformed walls. Whether you're renovating a charming period property or refreshing a modern space, this guide will help you get that smooth, flawless finish every time.
How long to leave plaster before painting
One of the most common questions we hear is: How long should I leave plaster before painting?
As a general rule, fresh plaster needs a minimum of 4 to 7 days to dry fully, though this can vary depending on the type and thickness of the plaster, as well as the temperature and humidity in the room. For thicker layers or lime-based plaster, drying may take up to 2–3 weeks.
How to tell when plaster is ready for painting
Forget guesswork – there are a few tell-tale signs to look for:
Colour: Fresh plaster starts off as a deep, dark pink. As it dries, it gradually lightens to a soft, consistent pale pink. This is your visual cue that the wall is drying nicely.
Touch: A dry wall will feel cool but not damp to the touch.
Moisture reading: For added certainty, you can use a moisture meter (an excellent investment for home improvement projects!). You’re looking for a reading of 15% or lower before you even think about reaching for a paintbrush.
How to Paint Newly Plastered Walls: Step-by-step
1. Let the plaster dry fully
This is the most crucial step – never paint over damp or dark pink plaster. Give it time to dry naturally. Speeding up the process with heaters or dehumidifiers can sometimes cause cracking, so if possible, let it dry at its own pace.
2. Prepare the surface
Once dry, inspect the surface:
Gently sand away any rough patches or trowel marks.
Wipe down the wall using a clean, dry cloth to remove any dust or debris. A clean surface helps the paint adhere better and last longer.
3. Apply a mist coat (seal the plaster)
This is the essential sealing stage – often skipped by DIYers, but vital for professional results.
- Mix standard emulsion paint with 10–30% water to create a thin, watered-down base coat
- Use a roller or large brush for even application
- Allow it to dry thoroughly before proceeding
The mist coat helps seal the porous surface, allowing your topcoats to glide on smoothly and stay put.
4. Apply your topcoats
Now the fun part – bringing your walls to life with colour. Choose a breathable, high-quality emulsion designed for interior walls (like ours!).
Apply two full coats, allowing each one to dry fully before applying the next.
Use a good-quality roller and brush to achieve a polished, professional finish.
FAQs: Painting new plaster walls
How long should I wait before painting new plaster?
At least 4–7 days, or until the plaster turns pale pink and feels completely dry to the touch. For thicker or lime-based plasters, wait 2–3 weeks.
What is a mist coat and why is it important?
A mist coat is a diluted layer of emulsion paint that seals the plaster. It helps your top coats adhere evenly and prevents the paint from soaking into the wall.
Can I paint plaster without sealing it first?
No. Unsealed plaster will absorb paint unevenly, leading to flaking, streaks, and wasted paint. A mist coat ensures a long-lasting, professional-looking finish.
Final thoughts
Taking the time to properly prepare and paint newly plastered walls is a small investment that pays off in the long run. With a little patience and the right approach, you’ll achieve a rich, elegant finish that complements any interior style – whether you're after timeless neutrals or bold modern hues.
Looking for premium paint recommendations or help selecting the perfect palette? Our team would be delighted to assist. Because when it comes to creating beautiful interiors, every detail matters.