I bought bulk quantities, not the disc multipack, so I didn't get the instructions. I'd been using either pure acetone or a blend of acetone and alcohol as recommended by a video I found. I'm betting the lack of water is the issue I'm dealing with. I almost always wipe my discs and put a hot dye on prior to adding swirls, so I've only worried about letting acetone dissipate on the couple of occasions I've wanted to preserve the stock stamp.
Agree that opaque premium plastic is the only way to go. I like painting with worm dye on the translucent/candy stuff, and that works pretty well for a stained glass look. I've actually had decent success with hot dyes on MVP Fission, which surprised me given how much it feels like baseline. They get blurry faster than other dyes, but they seem to reach a point where they set up and don't get any worse.
I really appreciate you sharing the ProChem instructions with me. I've got a couple beautiful white Plasma MVP discs I've been holding off on doing until I could get brighter colors. Hopefully this will finally let me get cracking on those! Thanks again! :clap: