I am in the process of building my first kayak (Redfish Return) and have nearly finished the hull. I was preparing to attach the stems over the weekend and much to my dismay I found my MAS resin had crystallized (stored at room temp all winter). MAS website says possibility of infinite shelf life. I emailed in a panic to Joe Greenley and MAS and received quick responses. Joe said put the jugs in hot water and the problem will go away. He was right an easy fix. MAS gave me the same advice but said they would send me two more gallons because of my trouble. The two gallons arrived today. I am an enthusiastic customer. Thanks for all of your help, this bulletin board has been an incredible amounto of help.