• Wow, vaseline does really well. I suppose if you heat it up so it's a liquid you can pour it inside your frame quite easily (heat up the frame too, so it doesn't immediately solidify and block up your tubes!)

    I've always used linseed oil myself - it's a polymerising oil - it dries to a hard, gummy finish and I've used it to protect the outside of bare-metal frames as well as the inside, and it doesn't rub off like other rust protectors do. Old aircraft manufacturers also used it to protect the inside of their tubular frames. I haven't done any scientific tests but my bare-metal frame went through winter with a couple of coats of linseed oil and didn't have a single spot of rust on it when I cleaned it in the spring.

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