Cutting, fitting and securing a patch panel is only part of the process. After the initial coats of primer are applied to the patch panel and surrounding areas, the primer should be given ample time to cure. When properly cured the primer should sand easily without clogging the 40 grit sandpaper. 
In the photo to the left, you will notice that I am applying filler to the door first. The door sustained only minimal damage. After it is repaired, I will use that surface as a guide to contour the patch panel area.
Also you will notice the adjacent areas have been masked to reduce the size of the work area.
Tom McCurry
Tommy's Topless Cars
843.338.2253
