15Kg Base Coat ResinTuffStuff Base Coat Resin is available to order in 15kg tins. Each tin holds approximately 13. 5 litres of base coat, which covers 10 square metres of roof space. For each square metre of 450gsm glass fibre reinforcing mat 1. 2 litres of base coat resin is required. If using thicker 600gsm glass fibre reinforcement mat 1. 6 litres of base coat resin is required. It is essential that cans are stirred thoroughly prior to use. Catalyst must be used with