The David's Fastglas Glass Fibre Mat is for use with David's Fastglas Resin (ISORE/LA) to repair holes, cracks and leaks. 0.55m squared, easy to cut with scissors Sets within 20-30 minutes Ideal for repairing holes, cracks & leaks Impervious to oil, water & many acids Can be used with Glass Fibre tissue to form glass fibre reinforced plastic For best results use David's Fastglas Resin (ISORE/LA). Clean tools immediately with acetone and cellulose thinners