Anyone spray the bottom of their truck with stuff such as POR-15 to combat rust? I am considering spraying the entire underside of my truck. I know it will take a lot of time and material but it may pay off in the end. What kind of stuff did you guys use?

 

I did half my frame about 4 years ago, and it still looks good in that area, being I'm on dirt roads. Just have rust streaks from crevices I couldn't get into. Por-15 takes a heck of a lot of prep work but seems to be good stuff. As long as there are no surprises, I plan on replaceing my cab real soon and will pick up where I left off on the frame, and probably hit the cab a bit, as well as fabbed bumpers.

 

Anyone ever thought about a spray in bed liner on the bottom of the cab? It would stip rust and seal any small holes in the floor......haha I have big dreams and no money, but that could be a good idea couldn't it?

 

NEVER, NEVER, NEVER, unercoat the bottom of a vehicle with something thick like spray in bedliner. In the long run it will CAUSE more problems then it prevents.
Reason; Unless there is 100% adhesion on 100% of the metal, in time some will peel away and form pockets which trap moisture, salt and other yucky stuff that WILL attack the metal you are tryingto protect. The bad thing is that with the undercoating being so thick, even with a close inspection, you will probably not be able to see the problems.
Thin protective material such as paint will work much better. The best is the special oil designed for this job. This oil is sprayed on and is designed to creep into faying surfaces and even appears to defy gravity.
BTW, did I mention that you must NEVER coat the underside of a vehicle with thick paint?

 

We paint all of ours(3) underneath to make them look good.

 

I agree with Mexstan.........with having a thick coat on everything it's impossible to see if there is any problems starting underneath the stuff....which could end up screwing you!!!!

I'd crawl under there and sand up the frame to get all the nasty junk off of there, and use a nice FLAT black paint to cover the entire thing.....that way if you do start to notice rust ( which will be very obvious ) you can jump on it quick and take care of it!!! Then when you are done, just grab your paint and blend the spot you fixed and you'll be good to go!!!



~Nick

 

I coated the entire underside of a CJ-7 that I had once while I was replacing the tub. It was properly prepped and applied so I was real happy with the results. Although I can see what Stan was pointing out, too.

My only piece of advice would be to make sure that you mask off your drive shaft when you apply the stuff ... getting enough of the goop on one side of the shaft will actually throw the thing off balance and cause a vibration that is a real bear to try to locate .... wouldn't have believed it myself if I hadn't seen it happen on a buddys Bronco .

PISTOL