EVAPO-RUST AND A FUEL SENDING UNIT

Bodyperson said
You don't submerse it. You flow it. 55 gallon barrel should do it

Got you.

Could even plumb in some fittings to flood the inner body cavities!

And get the seams on door, trunk, hood and body seams.

I like where this is going!

Could even epoxy paint the inside of the body cavities that way!

Hummmmm!