Now's a hell of a time to be thinking about doing something like
this!:>)
Oh, you must be in the tropics, or somewhere neat, where there might be
considerable warmth.
Anyway, last summer, I wiped down the bottom of my unit with mineral
spirits, using a skuff pad soaked with it.
Let it evaporate, and then sprayed bed liner to the underside of the
van.
It is a polyurethane rubber,and it seems to be pretty bullet proof,as it
hasen't moved or fell off yet.
My wheel wells and areas that I can see with out crawling under the van
are intact, and rust free.
The bedliner is made by the Morton Co., and available at all better body
shop supply houses.

Later,

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Terry 85 GL