I used it on a transparency with dazzling diamonds without even heating it and didn't have a problem at all. They do say that non-porous surfaces need to be used or at least are those that work best, the glossy paper kind of mimic's that, for a while at least. Card stock isn't going to work as well, it absorbs the glue too fast. Perhaps spraying the cardstock with a matte finish first will help so it doesn't absorb as quickly.
HTH - Linda T
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