Good idea. I want the 3″ because I do mobile body work which is mostly bumpers.
If the gouges aren’t too deep, I use Evercoat’s polyflex filler for bumpers. It provides the flexibility that epoxy does but is much easier to sand.
Good advice Chuck. I can’t find a 3″ interface pad, otherwise I’d use that to get a little closer to edges. You’re being smart, not lazy.