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Help and advice from experienced flat roofers
Water Cut Off Mastic is a butyl blend mastic used for sealing membrane edges when creating a compression type termination. Water Cut Off Mastic is extremely tacky and will remain so through its life. It must be used with a termination bar or similar compression type seal.
Water Cut Off Mastic is primarily used as a sealing agent between various membranes and applicable when membrane is being terminated using a compression.