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Check the Coroplast website for their recommendations. Also check with the local auto body paint suppliers. If you want, switch to ABS plastic which is used on auto fascia. Light sanding, 400 or 600, clean and tack rag, light primer coat, use automotive basecoat / clearcoat acrylic enamel or an industrial grade enamel. White rubberized undercoat can be painted over for abrasion resistance. Use a respirator and down draft paint booth. A large box and a shop vacuum vented outside will do. A heat lamp might be handy as the ambient temperature drops below 70 F.
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