What should be sprayed over an original OEM finish before clearcoating?

Spraying an adhesion promoter over an original OEM finish before applying a clearcoat is essential for ensuring proper bonding between layers. OEM finishes are designed for durability and resistance, which can make it challenging for new layers of paint or clearcoat to properly adhere.

An adhesion promoter enhances the surface properties, allowing the clearcoat to form a strong bond with the existing finish. This step is particularly critical if the OEM finish is glossy or has been polished, as these surfaces can repel additional paint applications. The use of an adhesion promoter prevents issues such as delamination and peeling, ensuring that the final clearcoat provides optimal protection and finish quality.

While the other options—colorcoat, flex additive, and urethane coat—are relevant in different contexts, they do not serve the specific purpose of improving the bond between the original finish and the clearcoat. Colorcoat is used for tinting or changing the color, flex additives adjust the flexibility of the paint, and urethane coats may provide a protective layer but do not specifically enhance adhesion to an existing finish. Thus, an adhesion promoter is the most suitable choice in this scenario.