System Three General Purpose Epoxy Hardener #2, Quart is a medium fast drying hardener designed for use with System Three General Purpose Resin. It cures in about 30 minutes even at temperatures as low as 55 degrees Fahrenheit, making it reliable for various working conditions. The tack- time is between 4 to 6 hours at 77 degrees Fahrenheit, ensuring a smooth finish. This hardener should be combined with the resin in a ratio of 2 parts resin to 1 part hardener for optimal performance. Proudly made in the USA, it quality and consistency for your epoxy projects. Model Number: