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Yes, that's what I meant: trying to paint directly on the clear coat surface. Sorry I wasn't clearer. That polyester coating is there to prevent oxidation, and is okay for adhesive films like printed vinyl lettering, epoxy paint, or solvent inks, but regular oils or acrylics would be at risk for delaminating unless it is primed first. I'm actually just repeating advice I was given by the manufacturer and sign painters. One guy I spoke to uses them for outdoor murals, and that's how he preps them: buffs with a sander, primes them, and paints in acrylics. The only time I've used it is as a canvas support myself.
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