I just did such a dumb thing... I baked some earrings which are going to get a coating of resin. In order that I would not forget to add the crystal flatbacks on top of the resin, I put the crystals next to the clay while it baked. DUH. the hotfix glue was activated and now I can't even get the crystals off my baking sheet! I can be reminded of my dopey mistake forever : ) So, if you were wondering, yes, that hotfix glue is really strong!