Quattro Seal is a robust liquid sealing system that increases air tightness in buildings. Fills any shape of gap to form bespoke industrial grade gaskets. Effective on all windows and doors (hinged, pivot, sliding sash and louvers) and all frame materials (metal, aluminium, wood, glass and UPVC).  Internal installation with no scaffolding required. After treatment all windows and doors work as they did before. English Heritage approved for listed buildings, Building Research Establishment tested with up to 27% energy savings achieved. A Salix approved technology for grant funding. Prolongs window and door lifetimes supporting the circular economy.