I used an air tool with a carbide bit. Same stuff they use to port manifolds and heads. I wouldn't want to imagine using a file to do the same job, but i guess it would work.
Color sanding refers to using different grades of fine to superfine wet sandpaper to achieve a finish.... Most all quality paintjobs require wet sanding after application of the final coat. In your case, you'd be using it to blend the touchup paint with the existing paint. elefantrider
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