System Three General Purpose Epoxy Resin, 1 Gallon is for wood construction and repair, gel coat blister repair, and general purpose fiberglass repair. This versatile epoxy excellent pot life and cure time control, allowing you to tailor the curing process to your needs. It can be mixed in a 2:1 ratio with various hardeners (sold separately) to achieve a wide range of cure times under different temperature conditions, even as low as 35 degrees Fahrenheit, without any humidity restrictions. Choose from USA Hardener for fast drying in 15 minutes with a tack- time of 2 hours at 77 degrees Fahrenheit, or USA#2 Hardener for medium fast drying in 30 minutes with a tack- time of 4-6 hours at 77 degrees Fahrenheit. This flexibility makes it an excellent choice for a variety of repair and construction projects.