I've had a can of POR-15 on the shelf not refrigerated for years and it's still good. The trick is to only open the can with a ice pick. Pour out what you want to use and put a sheet metal screw in the hole, then tip the can to get the screw wet on the inside to seal it up. Next time you need it just back the screw out or punch a new hole.
Oh, forgot to say I roll the can across the shop floor to stir it up, do not shake.
Works for me...
Mike B
