We're filling a trunk handle and lock hole he welded up. The welding-in of metal distorted the area enough that a high-build filler-primer wouldn't do the job in two or three coats. See All 19 ...

Good adhesion requires a clean and correctly prepared surface. This holds true for body filler as well as primer and/or paint. See All 11 Photos With the surface clean and dry, the next step would ...