So lately I have been working on my first pepakura helmet and I'm working on sanding the bondo on the outside. But there are problems I have encountered. First off, the helmet is very rough. There's dimples all over the place. (I'm pretty sure I just bondo over and sand again). In some areas, when I sanded, I could see the paper from the pep model. So I would love to get some tips to fix these problems and how to properly sand. Oh, and I was using a dremel, sand paper and a hand power sanding tool.