Dear Chadd, The best is to just take down the rust spots, leaving the remainder as little affected as possible. The 45degree answer is correct, but it will make little difference as long as it is that, or less from up and down. You will not be able to make them disappear because iron expands when rusted, and it expands out of a little pit it is making in the original. When you can't feel them, they are perfect. If over sanded, two things go wrong. The first is that that you spend too much time, the second is thet there is a chance of removing metal around the pit and causing poor sealing there. This is just a touchup to flat. 400 is OK, Good luck with the project. Remember this as the engine performs for you. Many engines with 1000 times the rust are started by brute force and survive. JimN
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