Sealants & Caulk

30+ products

Expected delivery: Tue, Nov 17

Sealants and caulk close gaps and joints against air, water, dust and fluids. This section covers 100 percent silicone, polyurethane, hybrid (silyl-modified polymer) and acrylic latex caulks, RTV gasket makers for flanges and covers, roof and gutter sealant, expanding foam sealant, pipe thread sealant, firestop sealant for penetrations, and manual and cordless caulk guns.

What to check before you order

  • Movement and surface. Silicone handles movement and weather well and suits glass, tile and metal. Polyurethane bonds strongly to concrete and is common for sidewalk and expansion joints. Hybrids work on many surfaces, including damp ones.
  • Paintability. Pure silicone generally cannot be painted. Choose acrylic, polyurethane or hybrid if the joint will be painted.
  • Joint size. Large joints usually need backer rod so the sealant bonds on two sides only.
  • Firestop. Use a firestop product that is part of a tested system for the exact penetration, as required by code and the authority having jurisdiction.
  • Food and potable water. Use only products labeled for those uses where they apply.

Common questions

How long does caulk take to cure?

It depends on the product, bead size, temperature and humidity. Most skin over within an hour, but full cure can take days. Check the label.

Browse adhesives and glue, seals, O-rings and gaskets, or all adhesives, sealants and tape.

Popular sealants & caulk

More in Adhesives, Sealants & Tape