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Hey guys, this is probably the dumbest question I'll ever ask on here, but: recently I found that something put a pretty good scrape on my car's underside on the frame rail. It went through the paint, and I don't want it to rust. What can I do to protect it from rusting? I just took an exterior touch up pen and put some paint on it. It looked terribly mismatched, so I also placed a piece of black electrical over it. Is there anything wrong with doing any of that? Is there something else I could do? I plan on keeping it awhile so I would prefer to protect it as much as I can.