Is there any ways to make the inside of the tubes of a steel bike rustproof. I thought of pouring WD-40 into the frame and then draining it back out might work for temporary. Clearcoat or rust paint would be permanent and the added weight of clearcoat would be negligable I think. If clearcoat gets on any parts that need sanding later might be a problem with voiding any warranty. any ideas? might this work?
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Thread: steel frame rust-proofing