I've left BSI, and Devcon on the pegboard for a couple of years during a slack building period and no issues, building more now so I go threw it pretty quick. Have had a problem with unopened Gorilla Glue going bad on me so I only buy small quantities as I need it. Good to know about the Tower stuff, I stock it for our build club and don't refrigerate it, think I'll put it in the reefer nnext to the CA.