Adhesive Caulk

Select by substrate compatibility (wood, metal, glass, masonry), movement capability (flexibility and elongation for joints that expand/contract), cure type (silicone, polyurethane, acrylic, hybrid), paintability if you plan to paint, and indoor vs. outdoor use for weather and UV resistance

Silicone offers excellent waterproofing and UV resistance but is often not paintable; polyurethane has strong adhesion and durability on varied materials but can be messier; acrylic (latex) is paintable and easy to tool but less flexible and less durable outdoors

Estimate linear feet and joint size to calculate volume; small projects often use 10–12 oz cartridges, while larger jobs or frequent use may justify larger cartridges or sausages; buy a bit extra to account for mistakes or rough surfaces

Clean surfaces of dirt, oil, old caulk, and loose material; ensure surfaces are dry and at recommended temperature; use primer if specified by the manufacturer for certain materials like porous masonry or high-density plastics

Skin time is typically minutes to an hour, but full cure ranges from 24 hours to several days depending on type, bead thickness, temperature, and humidity; paintability and water exposure depend on the product—follow the manufacturer's stated cure times

A caulk gun sized for the cartridge, utility knife for trimming, masking tape for straight edges, a smoothing tool or fingertip with a damp cloth for tooling, and solvent or cleaner recommended for the caulk type for cleanup

Store in a cool, dry place sealed against air; cartridges can be kept months if unopened, while opened cartridges should be sealed tightly and used within weeks to a few months depending on type and storage conditions