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I'm interested in hearing people's experience in painting on resin (which is to say two-part polyurethane resin, used for many detailed or larger miniatures). I've only painted a few resin pieces, mostly terrain, and while some were fine, some have at least in parts a slick and slippery surface which repels water and is extremely difficult to get paint to adhere to. These are the ones I'm having difficulty with. I scrubbed them multiple times with hot water and detergent, and they still have some surfaces that feel, I would say, almost soapy in slickness and on which paint beads up extremely. I actually had to paint them with brush in one hand and a hair dryer in the other to dry the paint before it could bead up, and it still took three or four layers of paint to get an even coat. I am concerned this might not be a great practice; it certainly is rough on detail. What are people's practices for painting on resin, especially the recalcitrant stuff? Do spray primers help? Would a light sanding be in order? (I am cautious about that option because of the toxicity of resin dust.) Anyhow, there doesn't seem to be a thread dealing with the specific matter of painting on resin, so this is here to gather people's experiences.