Henry_b
Think outside, no box required.
The BH salt spray tests start with bare steel.
Many years ago, Waxoyl used to be pretty good .... and we used to use quite a bit of it. Now, based on my experience, it is utter crap and not fit for purpose .... so we don't use it, we use BH and Dinitrol, which does work.
Also, IME, BH UB Wax would have stopped the rust on @Henry_b 's subframe.
I agree those products are lightyears ahead of waxoyl.
Waxoyl from 30yrs ago is no where near what it is now, the modern stuff is utter crap