Ive never experienced any problems with masonite. When I first started experimenting with oils, I painted on masonite panels, primed with an alkyd primer on both sides, had no problems with paint pealing, no warping, no fraying edges, chipping, none of that, and that was ten yrs ago and those pieces are still in great shape, theyve been roughed up, moved about by movers many times and not even a buckle or a scratch! Perhaps the priming is the key? especially the edges!
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