System Three General Purpose Epoxy Resin - Quart is for wood construction and repair, as well as gel coat blister repair and general-purpose fiberglass repairs. This versatile epoxy resin excellent pot life and cure time control, allowing you to tailor the curing process to your specific needs. It can be mixed in a 2:1 ratio with various hardeners (sold separately), providing a wide range of cure times suitable for different temperature conditions, even as low as 35 degrees Fahrenheit, with no humidity restrictions. The USA Hardener delivers a fast drying time of 15 minutes and cures in temperatures as low as 35 degrees Fahrenheit, with a tack- time of 2 hours at 77 degrees Fahrenheit. The #2 Hardener a medium fast drying time of 30 minutes, curing at temperatures as low as 55 degrees Fahrenheit, and a tack- time of 4 to 6 hours at 77 degrees Fahrenheit. Model Number: