https://www.acehardware.com/departments/paint-and-supplies/caulk-and-sealants/caulk/1015014
White Lightning Flame Buster Red Silicone Smoke/Fire Block Sealant 10 oz Mfr# W44117010 - Ace...
This premium silicone sealant is designed to block the spread of smoke and fire. It forms a water-resistant seal that will also resist smoke and toxic gases,...