Triton Tritosil H10 Grey PU sealant mastic is a high performance, single component, water based, elastomeric sealant. It is formulated with a unique blend of high quality raw materials to provide a long term, flexible, weatherproof seal. It is ideal for sealing around pipes, cable ducts, and other penetrations in exterior walls and roofs. It is also used for sealing around windows, doors, and other openings.