scratched HK USP ,what kind of finish...

[NETO1978]

Scratched my HK USP really hard , polished it with a dremer tool "rubber point", Would Perma Blue work on it?
Tried aluminum black , but of course it didn't work ,hk slide is made of steel...
tks

 

[cocojo]

Either check over at HK Pro or call HK. I would try a regular bluing pen.