Get this 3M Fire Barrier Sanded Paintable Latex Caulk CP 25 WB+ delivered onsite. Excellent adhesion. No-sag, non-halogen formula. Paintable. Protects against fire for up to 4 hours. Expands when exposed to heat to protect against smoke and toxic gasses. Dries to the touch in 15 minutes. Fire stop tested up to 4 hours in accordance with ASTM E 814 (UL 1479) and CAN/ULC S115. Fire resistance tested for static construction joint systems in accordance with ASTM E 1966 (UL 2079). Helps minimize sound transfer. Re-enterable/repairable. This product qualifies as an intumescent fire caulk.