Akfix Heat Fighter Black Fireplace Sealant - 2700 °F (1x10.1 oz.) - Heat Resistant Fireplace Stove Caulk for Chimneys, Ovens, Grills, Wood Stoves | Non-Flammable, Quick-Drying & Paintable Cartridge — Open-Box, 9% Off

Withstands Extreme Heat Up to 2700°F: Built for direct flame contact. Ideal for sealing and insulating fireplaces, stoves, ovens, chimneys, and furnace joints.

Excellent Adhesion on Porous Surfaces: Sticks securely to brick, concrete, stone, and metal. No cracking or fragmentation after curing.

Fast Skin Formation & Smooth Application: Skins over in just 3 to 5 minutes. Easily shaped using a putty knife or caulk tool for clean, professional results.

Seals Gaps & Cracks in High-Heat Zones: Perfect for fireplace doors, stove pipes, flue connections, and any static joints exposed to high temperatures.

Low Odor & Indoor Safe: Low odor formula is safe for indoor use. After initial heating to 482°F, the cured sealant turns dark grey and hardens permanently.

Akfix 1500 Heat Fighter is a premium, one-component silicate-based sealant designed to handle extreme temperatures — up to 2732°F (1500°C). Whether you're sealing a wood stove, insulating a chimney, or repairing a cracked firebox, this high-performance sealant delivers the heat resistance and durability you need. Formulated for permanent adhesion to brick, concrete, stone, and metal, it offers easy application and cures to an ultra-hard, fire-resistant finish. After initial curing, slowly heat the sealant up to 482°F (250°C) to trigger final hardening — the color will darken, and the material becomes extra rigid. The 10.5 oz (310 ml) cartridge fits standard caulking guns and is ideal for professionals and DIYers alike. It’s a must-have for anyone working with high-temperature appliances or fire-rated construction.