TotalBoat Gelcoat and TotalBoat polyester resin products will eventually harden in their containers - even without mixing in MEKP catalyst. The length of their limited shelf life depends on each product's formulation and the conditions in which they're stored.

Typically, the shelf life for uncatalyzed polyester resins is about 6 months, if stored in cool, dry conditions, in temperatures below 70°F. If stored properly, the shelf life may exceed 6 months, but always check to see if the material has thickened or polymerized before using.