How to Choose Exterior Caulk and Sealant

The right sealant depends on where it's going and what it needs to bond to. Don't choose exterior caulk solely by color or because the tube says "all purpose."

What materials are you sealing?

Examples include wood, masonry, metal, vinyl, fiber cement, and window materials. Check compatibility.

How much movement occurs?

Some joints expand and contract more than others, and the sealant needs to tolerate the expected movement.

Will it be painted?

Some sealants can be painted. Others are meant to stay exposed. Check before application.

Is the joint supposed to be sealed?

Not every exterior gap should be filled. Some openings are intentionally part of drainage or ventilation systems. Understand the building detail before sealing it.

Preparation matters

Old failed sealant, dirt, and moisture can affect adhesion. Follow the product instructions.