Don't know why properly sanded edges would look bad with paint? One thing though, you have to bondo EVERYWHERE an edge meets a plane, then prime, then use a 'body filler' like 'Icicle' on the places the primer reveals. Print through of the panel intersections is the main problem. A very good technique is to use reveals everywhere panels meet or use a BIG roundover bit that bites into those crevasses. One or two good sealer coats and then 5 or 6 color coats should look great. Put a clear coat on top.