. Take an old brush, or do what I did and buy some cheap ones (#1 or bigger is probably best).
. Gently sqeeze the metal brush head so you can remove the bristles (I saved mine for future use as grass, etc.).
. Get some emory boards, the thinner the better, and look for the ones with differant grits on either side.
. Cut the board so it fits in the brush head and insert.
. Clamp the brush head tight, then trim the emory board to whatever size/shape you want (I got a couple down to 1/32" wide).
Now you've got mini-sanding tools, and the brush handles give you good control. You could also use styrene instead of emory board and make min-applicators for putty, etc. So don't toss those old brushes and give it a try.
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