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Bob Steele of Pete's Crazy Custom Jeeps in Quebec says, "I have a solution to the rust problem. Paint is fine but it will never stop the rust from inside. Heres what you do -- scrape off as much dirt, mud, rust scale, and loose paint as you can. 1 gallon of general purpose grease, 1 pint of STP (it's like molasses), 1 quart of motor oil (new or used, you could use a gear oil but there is a smell that lasts for quite a while), mix in a metal container, heat it up to a liquid state with a torch or plumber's torch. (Do this OUTDOORS only, BE CAREFUL WITH FIRE AND OILS, Don't Use Your Wife's Oven, and Don't Use Your Gas BBQ.) Then spray with a texture spray gun inside and outside the frame and do the whole tub underneath. It's thick enough warm that it won't drip much.
"Don't do this in your driveway and don't park it in the driveway for a week or so until it has settled. In a hot climate it may drip off some residue but it will stop dripping eventually. You can help it settle faster by driving down a dusty road. And this can be done on a new frame or on an older frame where the oils will reach places that paint won't, and absorb into the corrosion and stop the process.
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