Well, my 2005 truck had a lot of surface rust on the frame, so I thought I would nip it in the bud. I read a lot online about what to use and decided to go with the mar-hyde rust converter.
I used about 2 full cans to rust convert the frame, drive shaft, axles and hitch of 1 mid-sized pickup. I will probably go back and touch up with another can. I tried to avoid spraying on plastic parts, but it doesn't say anywhere that it will hurt plastic or rubber parts. It does say not to spray on any surface that exceeds 200 degrees, so I definitely avoided the exhaust and engine. The body itself looked perfect so I did not use any on the body. It seemed to do a good job. By the day after I sprayed, the rust had all converted to a smoother darker finish.
On the down side, the fumes seem very noxious. I used it outside, on a slightly breezy warm day and the fumes were still strong, especially if you got in the "cloud." I would only use it outside and preferably with some sort of mask and away from children or pets.
I am planning on coating the underside of the truck with fluid film also, but I have not done this yet. I am not planning on painting the frame. Its been about 2 weeks since I performed the initial treatment and I have had no problems.
Well, there is my story about mar-hyde. I am not an expert, but there is my experience. hope it helps someone.
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Mar-Hyde - One-Step Rust Converter Primer Sealer, 10 oz. aerosol (3509).
