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. Cured caulk is mold and mildew resistant. Easy to apply and tool. Provides a waterproof seal with excellent adhesion. Easy water clean-up. Indoor/outdoor use. Exceeds ASTM Specification C834.