Need to determine the correct product to stop and prevent rusting on the metal bracing on the ’64 corvette hardtop. There is a support rail across the front and sides of the fiberglass top that hold the stainless steel trim and the weather stripping. It is difficult to get to the undersides of this support brace. I have a couple of holes rusted completely through and some very small screw holes. Is there something that I can get with a small tube (like WD-40) where I can get some rust preventer underneath this support brace? Maybe some thin liquid to pour into these tight spaces? Thanks for any help.