Caulks: Closing the Heating Gap

If your basement feels a little warmer than it should, you're probably losing precious heat from gaps in your ductwork. Close gaps in ductwork, pipes or flues with this heat-resistant, 100% silicone sealant.

It's designed for temperatures up to 500 degrees (constant) or 600 degrees (intermittent). Suitable for use indoors and out, it forms a waterproof seal that remains permanently flexible.

This sealant can also be on small engines, valves, tanks, appliancess and more. It adheres to glass, wood, metal, procelain and painted surfaces.