Duratex is water based acrylic, so it will be a little goober-y to sand. Something like acrylic wall paint, if you've ever done that. I'd be inclined to sand flat and spray with matte white, but you'll be limited to water base products. Maybe wrap, but you need a really good base to put it on...everything telegraphs through. You might do a search for Ridgid Thermo Foil (RTF) with PSA adhesive on the back. It's a thicker, more ridgid product that's more like veneer, but not commonly available in the consumer world when I last looked. I've wanted to do a video on it, but sourcing was problematic and showing how to do something that's not readily available seems kinda pointless.