• Excellent for replacing and/or repairing fireplace bricks, building or repairing fire pits and pizza ovens, and providing a protective covering to materials • 4kg = 1 average house brick • Suitable for interior or exterior • Air dries in 24 hours • Heat resistant to 1000°C • Grey colour Instant Brick Castable Cement is a heat-resistant air setting/ heat setting firebrick mix. Perfect for repairing or replacing bricks in stoves, fireplaces, and furnaces, and for lining pot belly stoves. With exceptional strength and abrasion resistance, Instant Brick Castable Cement is asbestos-free and gives off no toxic fumes.