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you can only treat the rust you can see and not stop the rust that will be under the paint waiting to break out. try to get a product called Dioxidine from an auto paint outlet, brush it on the rust and wait till it goes black, generally around 12 hours, then sand it of and use a good self etching metal primer. the reason these scopes are rusting is that there is no etch primer on the steel and the paint is porous so the moisture sits between the steel and the top coat and forms rust.
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