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Old 05-01-2016, 07:13 PM   #1
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Rust on bottom of chasis.

I have my class c rv f-450 chasis parked on a gravel driveway. I've noticed rust forming on the underneath of the chasis. I've posted a couple pics below. My questions:
1) is the rust due to moisture coming up from the ground and if so could I put down some plastic to help?
2) should I coat the underneath with rust prohibitor or rubber undercoating?
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Old 05-01-2016, 07:31 PM   #2
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Rust forms with water, oxygen and iron interacting. I doubt if putting down plastic will do much to slow the rust. Before covering the rusty metal with undercoating, be sure to treat the rust with Naval Jelly to chemically change the rust so it doesn't continue under the sealant.
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Old 05-01-2016, 10:25 PM   #3
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You will seldom have a corrosion problem with the chassis or chassis components. The chassis manufacturers have their act together in comparison to the coach or RV portion of the rig. Other than problems with the oil pan on some Diesel engine Ford products, corrosion issues are generally with the RV welded items and some metal LP piping.
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Old 05-01-2016, 10:28 PM   #4
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CAT engines have also been known to have rusted through oil pans.
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Old 05-02-2016, 07:48 AM   #5
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I'd say yes. A few years back we sold our house and lived in an RV park for about a year while we built another. We had a long gravel parking pad and I parked my previously garage kept HD motorcycle on the pad. I kept it covered, but fought rust for the entire year as water would condense on the bike under the cover. I'm sure the underside of the coach is the same type of environment.
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Old 05-02-2016, 10:13 AM   #6
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Quote:
Originally Posted by barmcd View Post
I'd say yes. A few years back we sold our house and lived in an RV park for about a year while we built another. We had a long gravel parking pad and I parked my previously garage kept HD motorcycle on the pad. I kept it covered, but fought rust for the entire year as water would condense on the bike under the cover. I'm sure the underside of the coach is the same type of environment.
Your cover was waterproof, but not air-tight. Moisture trapped under the cover stayed because it couldn't evaporate as quickly as it would in open air. The humidity went up and rust happened.

If the OP puts down plastic, it will also trap moisture under it. The additional water will create a 'mini-marine' environment around the edges as the moisture escapes. This added humidity will accelerate rust, not inhibit it.

Most of the rust pictured will cause little damage to the RV for many years. Perhaps a misting of oil on the gear rack and bolts will slow down the rusting, but unless he moves to an arid area, rust will continue, even behind undercoating.
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