Absolutely. Clean the inside and etch it as best as possible. Then shoot a couple of coats in the inside of your frame using the UnderSeal Gun and Probe: http://www.kbs-coatings.com/Underseal-Spray-Gun-amp-Probe_p_37.html
Complete RustSeal instructions can be found here: http://www.kbs-coatings.com/RustSeal-Information-and-Instructions_ep_38-1.html
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