System Three General Purpose Epoxy works great for wood construction and repair, for gel coat blister repair, and for general fiberglass repair. Use at a simple 2:1 volume ratio with any of the three hardeners. Use at temperatures as low as 35 F with no limitations on humidity. The medium-low viscosity of System Three General Purpose Epoxy allows for use as is for coating and fiberglass work. Combine with different fillers to make adhesive, filleting and fairing compounds.