hi dragonfire, appreciate your response.
I store my tins in a plastic container, no lid. I think ill need to store them on a shelv in a cupboard...i knew it had something to do with the heat warming up the chemicals and expanding through the lid due to pressure, or something lol just wasnt sure.
Well i better go make room in a cool cupboard shelv :)
thankx for the reply dragonfire...gordon J