ABC Sealants stock a large selection of silicone sealants, polyurethane sealants, modified polymers, acrylics, hybrid adhesive sealants and more for use externally on brickwork, concrete, window frames, door frames, upvc, most plastics and most metals, by all of the very best, exterior mastic joint sealant manufacturers Dow Sika Everbuild, and more. All of our exterior mastic joint sealants are weatherproofing by nature and are supplied in various colours to suit specific applications.