Fosroc Primer 7 comes as a single part ready to use brush on liquid that prepares and improves porous surfaces such as concrete stone brickwork timber and unglazed edges of ceramic tiles prior to the application of Thioflex 600 Polysulphide sealant. Uses: Essential for use with the ever popular polysulfide sealant Thioflex 600 Widely used for sealing movement joints in building and civil engineering structures
