ALEX FAST DRY Acrylic Latex Caulk Plus Silicone is ready to paint in 20 minutes so you can finish the job faster.This durable, flexible caulk won?t crack paint, applies and tools easily and provides a waterproof seal with excellent adhesion. Can be applied on interior or exterior surfaces and cleans up easily with water. Cured caulk is mold and mildew resistant. Exceeds ASTM Specification C834.