Are they resin? 6 hours is not enough. That resin is awful for getting paint to stick. I'm not sure if soap is not strong enough to get the mold release to come off or what the deal is (some other resin kits ive got suggest soaking them in Mineral Spirits first), but paint does not stick to those resin walls worth a darn. I had a pickle factory that I had to leave for like a month before I had any confidence the paint had dried. I dont think I even tried to tape and paint another color, I just painted the rest of it by hand from that point. Korber resin kits have become my least favorite thing to build, not just because of painting issues, but thats a lot of it.
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