Blue Gee Glassfibre GRP Polyester Repair Pack - Small, Medium or Large All you need to make a GRP repair. Includes resin and catalyst. Woven fabric (in preference to chop strand matt), mixing pots, brush, spatula and detailed instructions. Three pack sizes available which have enough materials to repair the area indicated. Small: 1/4m2, Medium: 1/2m2 and Large 1m2.