Oil.

Someone undercoated one of my '90 Burbs... Rear brake line developed a hole, due to abrasion against the frame rail. Took a lot of heating, scraping and cursing to repair that hard-line. Just for easy of maintenance and repairs, I have vowed to never undercoat a vehicle. I nearly drove that truck into the bush to light it on fire and be done with it.

Not that you are doing this, but if you ever do a frame-off restore, use a zinc based primer and a good sealer. Should outlast you and I both.

 

If you spray something like WD40 on your rails a couple times a month in the winter and maybe once a month in the summer, you will be fine.

 

How about the Amsoil HD metal protector? Does anyone have experience with it?

 

a buddy of mine has a spray jug full of waste oil he hits everything under his truck with that before winter. I know a few people that do that Cheap and easy way to protect frame a little
I think the best way to protect undercarriage though is to wash it after every time the roads get salted I have an underbody washer that attaches to pressure washer works mint to get salt off

 

do you have a link or a name to that spray jug?? and ya the new truck has 8'' of lift on it so getting under neath it with a power washer won't be an issue.. just figured you guys would have any ideas on how to use all the waste oil i have to oil the frame. and WD-40 i dont like, it rubs off way to easy..

 

Oil.

I have also heard horror stories about undercoating. If it isn't done right, you can get moisture in between coating and frame, and it will just sit there. Just imagine salt sitting in there. Once the frame starts rusting, it'll spread like herpes.

I wipe my frame down with used motor oil every time I change the oil. Talk about looking better than new. I get compliments all the time about how clean my truck is.

Don't get the oil on the bushings though. I've heard the oil will eat them up. Maybe somebody can shed some more light on this.

Also, no idea where you are, but they do these oil under body coatings in Canada. Look for Krown Underbody Coating.

 

So you just spray oil all over the bottom of your truck?

 

Pretty much. I guess that's how they do it. I would imagine they put your truck up on a hoist and go to town. I'm not 100% sure how they do it though.

I am going to buy a cheap paint sprayer gun at Harbor Freight, and fill the hopper/canister with either oil or maybe a heavy weight gear lube, or just a good rust preventative oil. I don't drive my truck in the winter, but I like knowing everything is lubed up and moving like it should.

 

I ain't doing that. I live on a gravel road. The first time out everything would be brown. Dirt sticks to oil like glue then turns all gummy and a is a bitch to clean off.
I will say that the paint on the back of our tractors where there are always small oil leaks looks brand new after I wash all that gummy crap off.

 

I just sprayed my moms Traverse's undercarriage with Fluid Film. Did some research on it and it seems to be the stuff to use. It is very harmless as far as MSDS goes. The stuff looks like caramel and sprays easily. I picked up a kit online from kellsportproducts.com that had a gallon of it, spray gun, 2 cans for the gun, aerosol can of it, extension hose for aerosol can, and plugs for drilling holes if you want to take out that far (I didn't drill holes). Kit was $70 with coupon code and should last all winter. I'll see how it works. I didn't do my truck yet since I don't drive it in winter but I probably will to keep the underside mint. Took me about an hour and a half to spray everything with it on jack stands with the wheels off.

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Fluid Film is good stuff. Did mine with it.

^^ This. Its what I use, but sadly I didnt get to it before this winter

I have some bar and chain lube, I think I'll try and use a weed sprayer and hit the underside of my truck

Theres a guy in my state that uses bar n chain heated up and sprayed on. Id say its the best option, but I went for Fluid Film as it was something that I could do in my driveway without an oil slick everywhere

 

I sprayed mine with rustoleum stop rust paint. My pre paint process was ridiculous though. Plus I like the frame that hangs down on the side to be black.

 

Here in Canada undercoating with an oil based product is pretty much a must. The best stuff is called krown undercoating. It's like a really sticky oil that kind of soaks into bare metal and rust. It has really good creeping properties too. They don't spray it on the painted panels of the vehicle but If you don't clean your vehicle the stuff will creep from the backside of the panel and go almost a foot up the painted side.

 

I just let mine rust.

 

I have also heard horror stories about undercoating. I have never personally had a truck done undercoated though.
I usually get under my truck at somepoint in the summer, after a good degreasing and paint anything that is turning rusty color.
Then some buddies get together on a weekend and buy a shit load of chainsaw lube, mix it with old oil and go to town spraying all of our trucks.
The underside of my truck looks great for a truck that has been in salty winters all of its life.

 

I haven`t sprayed my 08 in my sig since the truck has never seen winter roads or salt. But all of my trucks prior to this since 1980 have been sprayed with used diesel oil. I usually used from a gallon to a gallon and a half. I sprayed the frame as well as all body panels, inside door panels and inner fenders. Never had a rust issue period on any of the trucks I did this to. There were a few of us guys that always got together twice a year and made a day out of it, since it`s a messy job, and as soon as each truck was done we`d head down a gravel road at 60-70 mph to dust seal it in, and also to get the airflow thru the body panels to help distribute the oil in the hard to get at places.

 

I don't live in the "rust belt" anymore, but when I did, I would save all my ATF, put it in a garden sprayer and spray everything underneath. Undercoating will almost always have voids where salt & moisture will get captured and cause more problems than you're trying to prevent. When I lived in Ohio, there were places that would bond sacrificial anode material inside the fenders, etc. Never tried it, I've heard mixed results. Just glad I live in a place where cars don't rust now.

 

Fluid Film is good stuff. Did mine with it.

 

Just a little landscape sprayer I believe

 

im just trying to figure out what to use as the sprayer

 

Undercoat here


Down in salt less / snowless Houston

 

at our shop any vehicle that comes in for under oiling gets a 3 stage process, first if its not spotless on the under side it gets steam pressure washer then fans set up to dry the underside, after it is dry we use a product called oto protect, it is an oily grease it has the consistency between honey and molasses, I spray inside the frame rails and the entire underside, especially where those plastic hangers are for the brake and fuel lines, inside the rocker panels, hood, doors, and tail gate we spray crown rust proofing oil on the inside edges and it is very good at creeping thru the seams, then a thick coating of oto protect after inside the doors, hoods and tail gate, it may sound over kill but the stuff they use on the highway around here is aggressive, with all the salt my truck goes from black to white of grey on a winter day and the new liquid salt they precoat the roads with is even

the only down side to this process is working on the underside is a dirty bitch lol , i'll post photos in a couple day's when my new fass set up comes in and I lit her up on the hoist

 

I think Im just going to use a wire wheel, some rustolem and a 12pack of bud light. The first nice saturday afternoon we get.

 

I live in the Rust Belt, they plaster the roads with Salt, and i mean just hammer it out on most County and Provincial roads, and now they even use a spray that is even worse.

We always use a drip-less oil spray, no this will not hurt your veichle it only helps create a barrier from the salt, and pretty much anyone who doesn't do this to your viechle is gaurented to have major paint issues within probably 4 to 5 years. i had a 03 Grand prix that i sprayed twice a year, and the thing still had paint on the frame (Red) paint. now you ask anyone from Canada or in Michagain thats very much uncomon. But this summer because of Crack heads my 03 Grand Prix now rests ontop a a junk pile, RIP haha

Anyone who is up in the air and says it's going to damage your vehicle i think i would do a little more research on it, you can even get different colors and sents for this stuff now.

 

You an buy an undercoat spray gun at napa cheap and we just spray bar and chain oil you can dilute it if needed to spray it. Stuff hardens up real nice and doesn't drip everywhere.


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I have some bar and chain lube, I think I'll try and use a weed sprayer and hit the underside of my truck

 

That's what I did, worked pretty well. I used a mixture of waste motor oil and kero.

 

I had the Krown rustproofing from Canada done, they have a couple places in the states that will do it. They go in the rockers, tailgate, doors, hood, etc. Stuff reminds me of motor honey, or STP. Working on the truck underneath can be oily now, small price to pay.

I also bought 5 gallons of the stuff, for doing my other vehicles. If you warm it up, it sprays very well from a paint sprayer.

Bought the trucks used from texas, so it is perfect underneath. Living in Ohio, I hope to keep it that way.