Thanks guys, I've been using the west system for years on other projects,their tech sheet states that their epoxies can last for years.Freeze cycles just make it a little thicker with a little crystallization. heating p a bit clears that up.They also say to test for proper mix rates at the thicker viscosity .I just find it funny that Smooth-On does not address storage life.Kind of think it's CYA with one year.Joe, I'm with you but I just found a deal on a two gallon kit, should make a lot of toys, lol jim