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Aluminum Black is as good as it gets unless you re-anodize it or paint it. All my SBR engravings have been treated with Aluminum Black and you can't tell the difference.
Kroil or Hoppes won't hurt anything on your gun. I like Kroil better. They are both solvents, but Kroil does a better job at protecting steel, but not as great as CLP. Kroil also seems to clean barrels faster than Hoppes. I mentioned Hoppes because it is probably easier to get as most places that sells guns have Hoppes products.
Get some acetone or gun scrubber to clean up what you want touched up on the aluminum. This is very important for the aluminum black to work. It needs to be free of all contaminants
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Ok I called the LGS & they have pretty much everything you suggested, including the CLP - which they highly suggested over Hoppes and everything else also.
I will get the CLP & aluminum black.
I have Non-Chlorinated Brakleen, can I use that as the acetone/gun scrubber or do you suggest something else?
Or when you say acetone, do you just mean regular rubbing alcohol? (if so I assume the highest purity is the best, I believe I have 91%)
The area in question for Aluminum black is larger than a pinhole, but smaller than a nail hole, but down to the bare metal.