Painting Molded ABS


Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Q. I am the quality specialist for a first-tier supplier to the automotive industry. In one of our product lines, we injection-mold parts, then paint and assemble them in this facility. We are having a problem painting an ABS injection-molded part, with dark, cloud-like spots and long parallel splays. The defect is consistent in location on each molded part. Can you help? J.C.

A. Although I worked with plastics many years ago, my area of expertise is organic coatings, not injection molding. Since the paint defect is in the same spot on every part, I believe you have a molding and not a painting problem. On the other hand, surface defects are often telegraphed through a coating. In that case, the problem can be solved by increasing the paint film thickness.  


  • Masking for Surface Finishing

    Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.

  • Paint Application Methods

    An overview of spraying, dipping, flow coating, and everything in between.

  • Coating Thickness Measurement: The Fundamentals

    A review of available test methods, common applications and innovative instrumentation...