The standard form of Fibreglass used in hand lay up and when used with polyester resin produces strong, stiff and tough laminates for Boats, Water tanks, Industrial and Domestic applications. Resin use is 2.25 times the weight of glass used, so for 1 sq. m of 450gm mat then 1kg of resin will be needed. Wet out is complete when the laminate is almost transparent. Available in 300g, 450g, 600g and 900g.