I purchased a new-to-me bike. It is steel from about 1978. The paint is chipped in a few spots, a couple spots on the chainstays, the rear dropouts where the QRs clamp, and a spot on the top tube.

The spot on the top tube was rusty: I removed the rust and painted the spot with rust inhibitor paint (POR-15). The bike is red. I was going to find some of the wife's nail polish that matches and touch up that spot. Good/bad idea? Or would Testors enamel model paint be more durable?

The other spots are not rusty. I was thinking of painting them with clear nail polish. Good/bad idea? I don't actually want to cover up those chips: I like the patina. I just want to protect the metal.

The frame is not noticeably rusted inside. Should I apply Framesaver? Spray WD40 inside? Or just let it be?

I live in a rainy place (Portland) but this bike will be ridden in fair weather, except if I happen to get caught out in a shower. The bike will live in my basement which is dry.