To paint or not to paint a trailer floor

[ronn]

OK Dean, regarding the enclosed trailer- if any cars drip oil, then you will only stain the wood. If you seal the wood, the oil will clean up far more easily. As far as longevity, the sealing would need to be done on the underside with undercoat or a sealer of any sort.
The latex paints that are out today do a wonderful job of sealing most everything. (plastic)
Oil stains and varnishes offer better penetration for the wood. You win with either.
side note....
Before I lay a vinyl floor, I take old house paint, mix it up good and use it as a sealer for the luan underlayment. It works well wo spending extra dough.