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Rust inhibitor
11-07-2011, 10:37 AM
Post: #1
Rust inhibitor
Is there some kind of rust inhibitor I can spray on an RV underbody to help in New England. We drive back from FL in January and the underbody is covered with salt. I can't wash it until spring.
Thanks
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11-07-2011, 11:49 AM (This post was last modified: 11-07-2011 12:00 PM by Rupe.)
Post: #2
RE: Rust inhibitor
It would seem that nothing is bullet proof when it comes to rust and road salt. Even the old stand by companies like Rusty Jones are starting to fade away because they are just not effective if not properly applied to 100% of the nooks & cranies. With unibody construction it's just not possible to hit every square inch of layered panel, spot weld, or double reinforcement, which is typically where rust starts.

I suspect you have the underside professionally done in the spring but you could make up a gadget to attach to your garden hose that would get most of it before parking. Get a piece of PVC pipe and some fittings to mate with the hose then drill holes along the length like a garden sprinkler. You can either wave it back and forth manually or drive over it several times for a rinse. Use blocks of wood where the tires go so you don't crush the pipe.

BTW, the best prevention in the off season by far is a high & dry parking space that is paved. Parking on the lawn or in gravel does nothing to keep ground moisture from rising up with the morning dew each day.

Edited to add: There are several rust inhibitors out there for DIY application and many are used in the auto body repair business for spot touch up after collision work. OTOH, the chances of the average layman doing a proper application in ALL of the hidden places are fairly slim and doing it after the fact (rust already showing?) is wasted effort.
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12-21-2011, 05:21 PM (This post was last modified: 12-21-2011 09:19 PM by way2old.)
Post: #3
RE: Rust inhibitor
I've seen POR15 used before on the undercarriage of cars, but as far as I know, it's primarily for truck bed lining. That being said, it wouldn't hurt to give it a shot.
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12-21-2011, 11:04 PM
Post: #4
RE: Rust inhibitor
POR15 is great stuff and I have used it many times... BUT... the key is to use it on bare / clean metal and get it into ALL of the hiden places, which is generally not possible working from the bottom side of a vehicle that is already assembled. OTOH, if they would only offer something like that for a new vehicle where the chassis is dipped on the assembly line, then that would be the cat's ass!
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