How do I plaster in excessive heat?
Although there is no definitive maximum room temperature for plastering, additional care should be taken when outside temperatures are considered higher than ‘normal’, as the plaster setting times may be reduced. It is advisable to apply smaller areas to allow for the reduced working time of the plaster. If in doubt, consider applying a test section to ensure that the installer is able to apply the plaster before it becomes unworkable.
Particular care should be taken if applying suction control to the substrate, and working in direct sunlight should be avoided. Additionally, windows should be kept shut to avoid the warm air drying the face of the plaster and causing crazing. If crazing does occur, or the plaster is drying too quickly, work should be stopped and reattempted when temperatures drop.