Conventional wisdom has it that 4x8 pvc foam board is not paintable. That’s a reasonable statement. Had I not spent six years researching painting uPVC I’d say the same thing. So: Can PVC be painted? The fact is that uPVC and cPVC (PVC from here on) are difficult to paint. The reason is, is that PVC has a low surface energy. All materials and liquids have a “surface...