What do some manufacturers recommend for preparing raw polyolefin bumper covers?

Manufacturers recommend heating raw polyolefin bumper covers in a spray booth to sweat out mold release agents because this method effectively removes residues that may impede paint adhesion. Mold release agents are used in the manufacturing process to facilitate the removal of parts from molds, and if these agents remain on the surface of the bumper cover, they can prevent paint and other finishes from bonding properly.

Heating the bumper covers allows the mold release agents to evaporate, resulting in a cleaner surface. This preparation step is crucial as it ensures that the paint will adhere well, leading to a more durable and aesthetically pleasing finish. The application of heat is a controlled approach that can be consistently applied across many parts, making it a common practice within the industry for achieving optimal results when painting polyolefin materials.

While other methods of surface preparation can be employed, such as cleaning or sanding, they may not be as effective in completely removing the residual mold release agents as heating does. Therefore, preheating in a spray booth is a widely recommended procedure by manufacturers when dealing with raw polyolefin parts.