QUESTIONS
How long does plaster take to dry?
Updated 03/26
By: Laura Macdonald
Reviewed: Alex Peters
If you’ve recently had a wall or ceiling plastered, you’re probably wondering how long it will take to dry, and when you can finally start decorating.
Plaster drying time can vary depending on temperature, ventilation and humidity, so it’s important not to rush the process.
Typical plaster drying time in normal conditions
How long plaster should dry before painting or wallpapering
Whether windows should be open or closed when plaster dries
Why plaster sometimes dries patchy or slowly
How long does plaster take to dry?
Fresh plaster typically takes around 3–5 days to dry in normal conditions. However, plaster drying time can vary depending on factors such as temperature, ventilation, humidity and the thickness of the plaster.
In cooler, poorly ventilated or humid rooms, plaster can take one to two weeks to dry completely.
You’ll know the plaster is dry when the surface changes from a darker pink or brown tone to an even pale pink colour.
If you notice patchy plaster drying, this is usually normal. Different areas dry at slightly different speeds.
What affects plaster drying time?
Plaster drying time can vary quite a bit depending on the conditions in your home.
The main factors include:
Room temperature: Warmer rooms help plaster dry faster, but very high heat can cause plaster to dry too quickly and crack
Ventilation: Good airflow allows moisture to escape. Rooms with poor ventilation will usually see slower plaster drying times
Humidity levels: High humidity slows evaporation, meaning plaster may stay damp for longer
Thickness of the plaster: Thicker layers naturally take longer to dry than thin finishing coats
Type of plaster used: Different products can dry at slightly different speeds, although most finishing plasters dry within a similar timeframe
Because of these factors, plaster drying time can range from a few days in warm, well-ventilated rooms to one or two weeks in cooler or more humid conditions.
How long does plaster take to dry before painting?
Even if plaster feels dry to the touch, it’s best to wait until it’s completely dry before painting.
Most plasterers recommend waiting at least 5–7 days before applying a mist coat.
Painting plaster too early can trap moisture in the wall, which may cause:
Peeling paint
Blistering
Poor adhesion
Before decorating, apply a mist coat (a diluted first coat of paint) so the plaster can absorb it properly.
How long does plaster take to dry in winter?
Plaster typically takes longer to dry in winter because lower temperatures and reduced airflow slow down evaporation.
During colder months, plaster drying time can increase to around 7–14 days or sometimes longer.
If you're plastering in winter, try to:
Maintain a steady room temperature
Improve airflow where possible
Avoid sudden temperature changes
Using gentle heaters for drying plaster can help, but blasting the room with heat can cause plaster to dry too quickly and crack.
Drying plaster: windows open or closed?
Good airflow is one of the best ways to help plaster dry evenly.
If weather conditions allow, keeping windows slightly open can improve ventilation and help moisture escape.
However, avoid:
Strong draughts
Direct heat sources
Rapid temperature changes
The goal is steady, even drying rather than trying to force the plaster to dry quickly.
Why is my plaster not drying?
If your plaster seems to be drying very slowly, several factors could be affecting it.
Common reasons include:
Poor ventilation
Cold temperatures
High humidity
Thick layers of plaster
Limited airflow in the room
Patchy drying is usually normal, especially in the early stages.
However, if plaster still looks dark or damp after several weeks, it may be worth asking a trusted local plasterer to take a look.
Checklist before decorating new plaster
Find trusted plasterers near you
If you’re planning plastering work in your home, a professional plasterer can ensure the job is done properly and advise on drying times based on your property.
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Plaster drying FAQs
Why is plaster cracking when drying?
Plaster can crack if it dries too quickly. This often happens when the room is heated too aggressively or exposed to strong draughts.
How long does ready mix plaster take to dry?
Ready-mix plaster usually takes 3–5 days to dry, although thicker applications or cooler conditions may extend this.
How long does it take for British Gypsum plaster to dry?
Most British Gypsum finishing plasters dry within 3–7 days, depending on conditions and thickness.
How long does plaster take to dry before papering?
Before wallpapering, plaster should be fully dry, which usually takes 7–14 days depending on conditions.
How long does plaster take to dry before a second coat?
If applying a second coat of plaster, the first coat typically needs 24 hours to firm up before the next layer is applied.
How long does Thistle MultiFinish plaster take to dry?
Thistle MultiFinish plaster usually dries within 3–5 days in normal conditions, although colder or humid environments may slow this down.
Is a dehumidifier good for drying plaster?
A dehumidifier can help remove excess moisture from the air, but it should be used carefully. Removing too much moisture too quickly can cause plaster to dry unevenly.
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