Re: Greasless compounds vs sandpaper
I think your first mistake was using a file at all. It left more work than it helped. The lowest you should ever have to go on aluminum is 80 grit, and that's just for the worst chewed-up pieces.
If you're sanding by hand you're in for a lot of heartache. Cart rolls are good for tight areas as jrow suggests, and a palm sander is good for wide flat areas.
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