anyone have bondo tips?

When I do filler. I use 80g only. I also clean it before each application. I would think lighter coats would prevent cracking as to 1 thick coat. The key is CLEAN. Clean the area good then clean it again till your ran isnt dirty. As said above the smoother you can get it applied the better you can shape it. If you have something thats a bit deeper then you would like or you need more strenght you can use some short strand fiberglass filler. Bondo brand is just fine but there are better products out there.

[ame="http://www.youtube.com/watch?v=KN_pWQXElNI&feature=related"]"Mixing Body Filler" paint my own car How to - YouTube[/ame]