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Coroplast is polypropylene, one of the waxy plastics, but it is used extensively for signage, so the factory gives it a "Corona Discharge" treatment to enhance adhesion. When you break open a fresh bale of the stuff, you get sparks like taking off a wool sweater in a dry room. I have seen a piece of it that lay on the ground for months still attract paint from the end of a pointed artists' brush from a short distance, producing an effect like a weak airbrush. However, I'm also having major flaking problems on a re-painted piece. So, it might be back to the sign shop for some vinyl wrap, which can be printed to any hue.
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