rust question

[Mr_Monkeywrench]

I have a Sig228 that I purchased from a police trade in. I was looking at the top of the slide with an led flashlight and I noticed some brown spots that if were on skin would resemble the beginning signs of cancer. Now there is quite a bit of holster wear. My question is, what can I do to stop it from spreading and maybe protect it in the future? Any answer will be helpful thanks.

[NapaCountyShooter]

Sand off the rust and keep a light layer of oil on it at all times. Refinish when you can or not.

[Mr_Monkeywrench]

Thanks for the advice. What grit sand do you recommend

[NapaCountyShooter]

I'd start real fine. Maybe 400 and if that doesn't work, get more coarse. You don't want to completely ruin the finish.

[Ed_in_Sac]

Have you tried cleaning it well with a solvent and then treating with rust inhibitor lubricant?

If it is only visible with a powerful light, sanding might be overkill

[smoothy8500]

I agree with Ed_in_Sac, penetrating oil and brass bristle brush would be the most aggressive I would even consider.