225g/m2 Fibreglass CSM provides strength and resilience to the TriRoof MultiFlex System and also helps ensure even coverage of the liquid material. 1kg will cover approximately 4.44m2. The fibreglass matting is embedded into the first coat of the resin system and, by working through with the roller, becomes fully consolidated with the resin. Please note each quantity relates to 1kg. E.g. Quantity of 3 will be 3kg.