undercoating or rustproofing
Fleet Mechanic
Joined: Feb 2019
Posts: 1,297
Likes: 170
From: Hunterdon Cnty N.J.
I like the guys talking about used motor oil. In the 90s I was looking at old pick ups for a restoration project. I checked out a 47 IH pickup that had lived on a farm in NJ its whole life. The farmer wrapped the springs and sections of frame with cloth and he sprayed the underside with used motor oil regularly. The truck was 50 years old and the springs looked new.
I had a 95 GMC Yukon GT that I bought with 30,000 miles. It was very well cared for and as new. I would crawl around doing the grease jobs and wipe excess grease of with my fingers and spread it on anything that showed bare metal or a hint of rust. I also sprayed WD 40 into the weep holes on the tailgate. When I sold it with 156,000 it still had 99% zero rust. Small bubbles did appear at the seam between the inner and outer sheet metal at the bottom of the tailgate. Thats it.
Unfortunately Ford doesnt believe in grease fittings until you get up to a 450. So Im doing the Fluid Film.
I had a 95 GMC Yukon GT that I bought with 30,000 miles. It was very well cared for and as new. I would crawl around doing the grease jobs and wipe excess grease of with my fingers and spread it on anything that showed bare metal or a hint of rust. I also sprayed WD 40 into the weep holes on the tailgate. When I sold it with 156,000 it still had 99% zero rust. Small bubbles did appear at the seam between the inner and outer sheet metal at the bottom of the tailgate. Thats it.
Unfortunately Ford doesnt believe in grease fittings until you get up to a 450. So Im doing the Fluid Film.
Cargo Master
Joined: Jul 2003
Posts: 3,358
Likes: 250
Been using Fluid Film since 2012 with great results. The 2012 and 2013 we traded in a couple years ago still looked like new after each having 6 winters under their belts. doing the same bi annual treatment with our two aluminum trucks and expect similar results. This fall I did modify my process by not washing the springs application off and just adding more. We didn't have much rain this summer and still had a good coating left from spring. It's messy and looks bad underneath but that's better than rust.
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