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Product Description Pyroseal is a smooth, creamy, easy spreading furnace and retort cement that sticks where you put it. For high temperature sealing and bonding. Shrink-proof, crack-proof. Use in combustion chambers and for sealing doors and flue pipes. 6-Pound (8-Piece) From the Manufacturer Pyroseal is a smooth, creamy, easy spreading furnace and retort cement that sticks where you put it. For high temperature sealing and bonding. Shrink-proof, crack-proof. Use in combustion chambers and for sealing doors and flue pipes. 6-Pound (8-Piece)