mine is undercoated with a nice petina of red clay mud, actually it has mud from 3 states under it, SC,NC and TN mud

 

Just google LPS #3 RUST INHIBITOR. I see you're in Bethlehem PA, I'm in north western NJ. I ordered my from McMaster-Carr in Dayton NJ, near South Brunswick. If it's ok with this site, their phone # is 732-329-3200.

Whimsey

 

No. It will do more harm than good. You will trap the corrosion causing stuff already on the truck under the undercoating.

 

I keep hearing this, but how is that possible if you coat the underside when its clean and dry? I keep thinking its still the lesser of two evils.

 

Anyone have any luck with the electronic rust protection units?

Canadian Tire

 

Would spraying WD-40 on the undercarriage prevent rust? or could it cause damage?

 

I just took the door panel off my 1990 F-250 which I bougt new 19 years ago. To my supprise there was NO rust. The rustproofer was a small business guy that used a black goo that he got from the US Go.v that was used on military aircraft. The company was called US Rust control in Miami. I hope they are still in business because after seeing the results, I want to take my 1996 F-350 back to them even though they are 350 miles away. The only problem is that the goo ran out of the door bottom for years

 

When I was stationed in NY I had a 89 buick as my winter car. It had ziebart on it from when it was new. I bought the car from an old lady who was the original owner and the car only had 75,000 miles on it. When I got it on a lift the bodymount through the frame and crossmember was completely gone I got it welded together and got rid of it before it killed me. I will never have that done.

 

The only rust I can find on my 1990 F250 is in the seat tracks where I left the windows open in a rainstorm and on the aftermarket class IV hitch.