My P2000 (BE date code) has developed rust in the proofmarks and HK laser etched logo. I've removed the rust with some CLP and scrubbing, but now the gold has turned dark grey, which I'm sure is a product of the corrosion. Has the laser etching cut through the tenifer treatment, or is the paint used by HK to color in the etchings oxidizing? This is a result of contact with sweat. This is a carry gun so I'm not worried about the aesthetics, but if bare metal is being exposed to the elements I might have to remedy that somehow. Thanks for the help.