The safest answer is based on the plaster actually on your wall, not a universal number of days. A thin skim, a deeper backing coat and a repaired area may dry at different rates. Ask which materials were used and wait until the whole surface is ready for the decoration system you plan to apply.
Drying is different from setting
Plaster can become firm enough to touch while it still contains moisture. Painting before it has dried can affect adhesion and trap moisture beneath the finish. The time is influenced by layer thickness, background, humidity, room temperature and ventilation. Cooler or poorly ventilated London rooms can take longer than a warm, well-ventilated room.
Do not assume a dark patch is a paint-ready surface. Look for a consistent, dry appearance across the whole wall or ceiling, and ask the plasterer when a particular product or repaired background needs extra time.
Help the room dry evenly
Use steady, appropriate ventilation and avoid trying to force the surface dry with intense direct heat. Consider how occupied rooms, winter conditions and other wet trades affect humidity. If a patch stays damp while the rest dries, check whether there is an unresolved leak or another moisture source before decorating.
Plan the first coat with your decorator
Once fully dry, new plaster usually needs a suitable first coat or primer before the final paint system. Follow the current guidance for the plaster and paint products selected. The first coat is part of the decorating specification, not a way to seal in moisture. If wallpaper or another low-permeability finish is planned, discuss the system before booking the decorator.
For newly plastered ceilings, allow for the same material-specific drying checks before painting overhead.
Before the painter arrives
- Confirm that the entire surface is dry, including thicker repairs and corners.
- Ask what plaster, backing or board was used and whether a primer is specified.
- Resolve leaks or persistent damp first.
- Agree the first coat with the decorator and check the paint maker’s guidance.
If you are still planning the plastering work, send photos and ask how the finish will affect your decorating schedule.
Before the first coat
Can I paint when the plaster feels dry to the touch?
Touch is not enough to judge the moisture throughout a thicker repair or full surface. Wait until it is fully dry and follow the guidance for the specific plaster and paint system.
Why is one patch drying more slowly?
It may be thicker, on a different background or in a cooler part of the room. If it remains persistently damp or follows a leak, check the moisture source before painting.
Discuss your own walls and ceilings
Send a wide photograph, close-ups of damage, the rooms involved and your postcode. We can discuss the surfaces, preparation and a free, no-obligation quotation.
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