What is a major cause of poor surface adhesion in automotive refinishing?

In automotive refinishing, poor surface adhesion is primarily caused by inadequate surface preparation or the presence of contaminants on the substrate. Proper surface preparation is essential for ensuring that the new finish adheres effectively to the underlying material. This includes cleaning the surface thoroughly to remove any dirt, grease, oils, or other substances that could interfere with adhesion.

Surface contaminants, even in small amounts, can create a barrier between the paint and the substrate, preventing the finish from bonding properly. Effective surface preparation methods include sanding, degreasing, and possibly applying a suitable primer to enhance adhesion. Without these steps, the longevity and integrity of the refinished surface can be compromised, leading to issues such as peeling, flaking, or bubbling of the paint.

While excessive heat during drying, using too many base coat layers, or not using a primer can also affect the quality of the finish, the foundational importance of cleaning and preparing the substrate directly influences the adhesion properties. Therefore, ensuring a clean, well-prepared surface is critical in achieving optimal results in automotive refinishing.