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Mike Spencer

writes:

Most of the "oil based" commercial products today are a vegetable
based oil today, which tends to wash off more quickly.
Raw linseed oil is a product that has been used successfully,
"wool oil" - aka Lanolin is also used commercially. (one example is
"fluid film")

Linseed oil eventually polymerizes, making it subjct to the same
water-creeps-under problem as rubber.

Fluid Film(tm) goes on kinda gloppy, thus doesn't drip, which is good.
But it's thixotropic so the vibrations of normal driving allow it to
flow and penetrate the interstices in superficial rust, getting as
close to the bare metal a possible. Seems to be keeping my '89 F250
from getting any worse than it was when I got it a decade ago.

--
Mike Spencer Nova Scotia, Canada