Hero Arts and Inkadinkado, specifically, should be fine in any type of case. If yours are like the ones I have, they actually have a film on the cling side, rather than the foam itself directly sticking to the block or case. (Similar to the sticker on the SU cling stamps, if you were to use it.)
For stamps from other companies, I would ask if you are talking about the DVD-sized cases from SU, or DVD cases from elsewhere?
I have some DVD cases that are the same material as CD cases. The cling foam from my unmounted stamps has etched into these, but for me, it doesn't seem to have affected their clingy-ness. But I am slowly working on moving them into SU cases, just to be on the safe side, and using the DVD cases for just my clear stamps.
__________________ Traci
Who needs tattoos? I already have ink in strange places...
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