Originally Posted by
ofgit
Boiled linseed oil was the standard method of preventing rust in the 4130 tubes on airplane structures for many, many years. Still works better/lasts longer than some modern chemical treatments. I've used LPS-3 in several frames. Also don't generally subject my bikes to water soakings/submergings.
You don't have to soak 'em to get them rusty inside. Store them in a non=climate controlled environment and they'll rust just fine. Fall and Winter temperature swings during mornings and evenings plus humidity can cause condensation, add some oxygen and non-treated steel surfaces will rust.