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The HeatShield Flue Sealant & Repair System was developed to restore flue tile and masonry chimney interiors to their original integrity. In suitable chimneys, HeatShield can provide a very effective and durable repair system. It can be applied solely to open mortar joints, or a thin coating can be applied to the entire flue to fill joints, seal cracks, and structurally reinforce clay flue lined chimney interiors.