![]() Plastic parts, however, absorb the heat and can soften or even re-flow under power sanding. You have to be sure to do a good job cleaning. Metal parts also get warm as sanding friction heats them up, but metal tends to reflect the heat back out. The whole prep process will be iterations of sanding, cleaning and priming. Sanding friction causes heat, and plastic parts act like a heat sink. Let’s start by talking about sanding plastic components. The most common concentration for a working primer solution is 10 M. Whether thermoplastic or thermoset, today’s parts can be treated uniformly. ![]() I’m pleased to report that to successfully paint plastic automobile parts today, it’s no longer necessary to name the plastic first. Some identification tests included floating a chunk of the unknown material in water. Over time, painters were expected to burn a sliver of the mystery plastic and name it based on the color of the flame or the smell of the smoke. When the identifier was missing, other methods of identification were necessary. Once the material has hardened (in about 20 minutes), move to the front of the fascia and remove any tape (if applied). And auto painters have suffered through a lot of grief trying to identify the type of plastic based on a two- or three-letter identifier stamped (seldom) on the back of the part. PLASTIC PRIMER TRANSPARENT SPRAY PAINT CAR AUTO BUMPER CLEAR ADHESION 500ml (3) £9. ![]() It’s been a long road from the first flexible bumper cover on the 1967 Pontiac GTO to the latest body cladding on the 2004 Pontiac Aztec.
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