I've bought a few cars from the south and brought them up to Ohio. Invariably, these cars have not been rust-proofed, and in a couple cases it really bit me. But what about rust-proofing a used car? Seems like spraying the rust proofing over any gunk or grime or dirt or even rust would just seal it in. What do you guys say about this?
Don't they normally steam-blast the underside first?
Disolve/Melt (be careful!) two wax toilet rings in a gallon of mineral spirits and stir in a quart of cheap non-detergent motor oil. Put in a cheap yard sprayer and spray the entire undercarriage. Works like a CHARM!
I have used vehicles rust-proofed all the time. I do it in the summer so that it is relatively clean.
Wish I had done it to my WRX, but it was already well along.
ebonyandivory wrote: Disolve/Melt (be careful!) two wax toilet rings in a gallon of mineral spirits and stir in a quart of cheap non-detergent motor oil. Put in a cheap yard sprayer and spray the entire undercarriage. Works like a CHARM!
You should call your creation WaxOil! 
I hit our vehicles with Fluid Film every summer. I spray the undercarriages with my power washer first, sometimes I do a pre-spray of Simple Green before that. Let it dry for at least a day, then apply the FF. So far so good.
In reply to Tom_Spangler:
What about inner panels? I'd like to do those also, but am concerned that I won't be able to get them clean enough first.
bravenrace wrote: In reply to Tom_Spangler: What about inner panels? I'd like to do those also, but am concerned that I won't be able to get them clean enough first.
Well, if you mean the inside of doors and such, obviously you can't clean inside them. I just use a spray can of Fluid Film with a thin, flexible hose to get inside them. For the back side of things like fenders, I just do my best with the power washer. You can't get everything with this method, but you can get most of it.
I had a thought of using alcohol to flush inner doors and structural areas. Theory was that it would dissolve any oils etc and evaporate cleanly without leaving any traces of moisture. Then apply your desired protectant material. Good idea or crack pipe?
As long as you get the salt rinsed off anything else stuck on there will just add to the viscosity of the oil. Ever see/hear of the front cross member on an old RWD American car rot out? They don't because they have had motor oil dripped/sprayed on them since the car was 3-4 years old.
aircooled wrote:ebonyandivory wrote: Disolve/Melt (be careful!) two wax toilet rings in a gallon of mineral spirits and stir in a quart of cheap non-detergent motor oil. Put in a cheap yard sprayer and spray the entire undercarriage. Works like a CHARM!You should call your creation WaxOil!
...yeah and charge like $95.00 a gallon too!
I spray used motor oil on the undersides of my cars. It seems to work, but I have no real proof. The legality in your area is another concern as they drip for a few days. You have to do this yearly. Most of the used cars I get already have surface rust on the underside. If I get a clean car I might try the wax bit or another trick of 1/2 rustolium and 1/2 thinner.
I'll second the Fluid Film. I got a truck that came from Texas and coated the inside and outside of the frame and inside the doors and just about everywhere I could. I got a few spray cans and a gallon from a John Deere dealer, but then later found NAPA had it for cheaper. Kellsportproducts carries it along with a 24" extension for spray cans and also spray guns. It leaves a smell (not bad) for a little while then goes away. After many hours of research, this stuff sounds awesome. I just started using it. That's all I've got BR. Now I'm wondering what you brought up here
In reply to Fletch1:
Nothing new. I did look hard when I was in Florida, but ended up not buying anything. I'm talking about my BMW, which is seeing it's first winter ever. Unfortunately I didn't even think about it until after it got salt on it.
From the website:
Will FLUID FILM remove rust? FLUID FILM is not formulated to remove rust. However, if applied over existing rust, it will stop it immediately from spreading further. FLUID FILM will penetrate rust and rust scale to the base metal, loosening and easing in the removal process.
Does FLUID FILM attract dirt? Because FLUID FILM remains wet, it will get an initial dusting upon application, but because it contains no solvents and will not become sticky, it will not gum up or create a build up of dirt.
It's not suppose to hurt the paint either.
But how do you do the inner panels? Those are what I'm most concerned about.
In reply to bravenrace:
I did what Tom_Spangler suggested and just sprayed into the holes in the bottom of the doors with the extension that came with the can. I brushed some on the inside of the rear quarter panels on my Civic, which doesn't get everything but it's something. I always wondered about drilling some holes then spraying and then plugging in other places, but never tried it.
This guy just sticks his wand in a body panel opening and sprays. Giggity!
http://www.youtube.com/watch?v=zcNP4INYEMI
When we moved to OH I looked into all of this, and wound up just using the car wash at work about twice a month, sometimes more. My old Volvo's body is galvanized, and our Jetta didn't seem any worse for wear. We thankfully only did 3 winters up there before moving back to God's country.
bravenrace wrote: But how do you do the inner panels? Those are what I'm most concerned about.
Hey BR, I just sold an engine today to a guy from Akron. Guess what he does? He has an oil under coating business. He told me quite a lot about it too. He drills 1/2" holes in the doors and then just uses the standard body plug like any other rust proofer. He said he sprays inside the doors and lets the bottoms fill up a bit, then under the hood, around the rear trunk area, then everything underneath except the brakes and exhaust. I think he said he charges like 40 or 50 bucks to do the whole car. Sounded pretty reasonable to me. I have been very interested in oil type undercoating ever since seeing it on Dream Car garage. They used Krown, its only available in Canadia though. I thought about the fluid film, but read it doesn't stick(drips off very quickly) as well as advertised. I think I'm going to try either old motor oil, or heavy hydraulic oil.
I can PM you the number of the guy in Akron if your interested.
Good luck
Paul
Here is Krown's process. They drill access holes for the inner panels which was what I was wondering about in my last post and like Paul just mentioned. Drill baby drill
http://www.krown.com/process.php
ebonyandivory wrote: Disolve/Melt (be careful!) two wax toilet rings in a gallon of mineral spirits and stir in a quart of cheap non-detergent motor oil. Put in a cheap yard sprayer and spray the entire undercarriage. Works like a CHARM!
Would a bottle of STP make it better? Or substituting the oil for chainsaw bar oil?
What's rust?
A sleeping giant. He heard that, by the way.
In reply to series8217:
Automotive cancer.
The best permanent rust proofing is a one-way U-haul to the Southwest
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