Which step helps ensure paint adheres well to the surface?

• A. Cleaning the surface before applying primer
• B. Applying primer immediately after bonding
• C. Painting without sanding
• D. Using a glue-based primer

Answer: (A)

Proper surface preparation is essential for paint to adhere. Cleaning the surface before applying primer removes oils, waxes, dust, and oxidation that would create a barrier between the substrate and the primer. When those contaminants are removed, the primer can wet the surface evenly, fill in tiny imperfections, and form a solid, uniform bond that the paint can stick to over time. While sanding can help by providing a rougher texture for mechanical keying, it won’t matter if the surface is still dirty or oily. A primer is useful, but it can’t overcome contaminants left on the surface. Likewise, using a glue-based primer isn’t the typical or best approach for most automotive finishes. So, cleaning first sets the stage for reliable adhesion of the primer and the paint that follows.