TotalBoat Fast Hardener was constructed for repairing epoxy and fiberglass in cooler temperatures. The low-viscosity curing agent works perfectly with TotalBoat 5:1 and all other traditional 5:1 epoxy systems like Entropy, MAS, and West System. At 77 degree F, the pot life is 13 minutes compares to 25 minutes with TotalBoat Slow Hardener. Comparable to Entropy Super Sap CLF, MAS Fast Epoxy Hardener, System Three Fast Hardener, an West System 205. TotalBoat Fast Hardener is available in quarts, gallons, and 5 gallons. You shouldn't have to worry about waiting for warmer weather or to have to deal with slow curing times to build or repair a project. TotalBoat Fast Hardener was made so that applying epoxy would be much easier for customers who live in areas with colder weather like the northeast. All TotalBoat marine products are developed by boaters for boaters, to provide great value and great results.