I know there are a number a of things that could lead to this but I've sanded the surface, used acetone to clean it and let it dry for a day before trying again.  I have not washed the surface with soapy water to clean up any acetone residue which may be the problem.I did paint the board using Rust-Oleum 2x ultra cover which could also be creating the problem.  However after painting I sanded and cleaned with acetone.Sorry to hear you're having issues with your hotcoat. Orange peeling can occur from 3 things.1. Contaminants on the board - Acetone is typically not used with epoxy resins as it is an aggressive solvent and can break the epoxy bonds. Denatured alcohol is usually used to wipe a board down. I'm concerned the Rust-Oleum paint and acetone mix might be causing you the problems. We normally use acrylic paints on all our boards with no issue.2. Hotcoat thickness - The epoxy needs to be at a certain thickness on the board to maintain a proper surface tension to hold together while curing. Not sure what exact mil thickeness but the thicker the better. It will self level and smooth out.3. Temperature - Hot and humid climates can cause the hotcoat to cure quicker than it can flow and settle flat.I'm thinking it's the paint + acetone... the resin is perfectly fine and has an infinite shelf life if the cap is on tight.