I just recently bought my 2004 FX4 F150, and although it doesn't have ANY rust, I live in michigan and I am skeptical for this winter. I've been doing my research on undercoats and such and peoples opinions are all different.. I've ended up seeing many things about POR15 and i'm looking at that. I just need opinions, and if POR15 is recommended, would you use the degreaser,the metal prep, and the por15 on the underside of the truck?

Thanks guys

 

Yeah, that's good. If I had the time I'd use the degreaser and prep. Don't want to waste money and time on the 15 of it doesn't stick. My roommate and his dad build cars regularly and they love 15 both for the look and because it works very well.

 

I used Por-15 on the frame and engine compartment and floor of my '71 Olds. I used their Degreaser and Prep and followed the directions to the letter. Came out awesome.
However, it's not fully brake fluid proof.
I had some brake fluid leak from the reservoir that ended up on the frame behind the inner fender liner. It was there about a week before I noticed the bubbling of the Por-15.
If you wipe up any fluid spills right away, you won't have any issues.

 

Not much is brake fluid proof though. It says that right on the fluid bottle

 

POR15 is actually designed to work with rust. It is mostly phosphoric acid, which reacts with iron oxide AKA rust and forms a very tough coating over the base metal. It is widely used in repairing badly rusted gas tanks on older motorcycles, if that gives you any idea how tough a finish it produces. But if you have no rust you may want to leave it alone for a year.