Plaster setting versus drying: when is it ready?
Setting and drying are different processes. A firm surface does not mean all moisture has left. Decide when to apply the next layer using the product instructions and actual site conditions.
What changes the timing?
Thickness, humidity, temperature, substrate and ventilation affect application and drying. One fixed duration cannot describe all sites. Use the exact product guidance and the responsible installer’s assessment for working time and recoating.
What should be checked before decoration?
Check for residual moisture, damp areas, a weak or powdery surface and compatibility with the next coating. Touch alone or an arbitrary number of days is not enough to confirm readiness. Ask the installer or coating supplier if the condition is uncertain.
Your questions, answered
Can setting plaster be restored by adding water?
Do not retemper plaster that has started to set. Mix only what can be applied within the product’s working time and follow the manufacturer’s mixing instructions.
General application reference; this manufacturer’s numeric specifications do not apply to Pol Dokhtar products: National Gypsum: plaster application environment