I mentioned in a previous post, something about shapes. What I didn’t say (really understand) at the time, is the more time you spend sculpting your undershape the better off you are in the future. I make my shapes from mulched paper and cardboard (paper mache essentially) which needs some work after it dries.
The nice thing about this stuff is you can use a rasp on it and shape it, taking out most of the lumps and bumps. It is pretty strong as far as that goes.
This rasp was about five dollars, and it has five really rough settings on it. If you use anything other than typical shapes (like styrofoam circles and eggs) and instead opt to make your own, this tool is well worth the money.