



The primary difference is the formulation. Exterior caulks are designed with more flexibility to expand and contract with temperature changes and contain additives for UV resistance and mold/mildew prevention. Interior caulks are typically lower-odor and are formulated to be more easily paintable for a seamless finish on trim and baseboards.
Dry time depends on the type of caulk, temperature, and humidity. As a general rule, most paintable acrylic latex caulks are ready for painting within 2 to 4 hours. We will always advise you on the specific cure time for the products used on your project to ensure a perfect final result.
Yes, we absolutely have to remove the old caulk first. Applying new sealant over old, cracked, or failing caulk is the number one reason a caulking job fails quickly. The new caulk cannot form a strong, lasting bond to an unstable surface. For a durable, watertight, and professional result, completely removing the old caulk and cleaning the joint is a critical first step that we never skip.
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