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Old 01-25-2017, 08:29 PM   #1
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The Underside

Some friends of ours do not have inside storage for their rig and store it on a concrete pad. After only a few years, due to moisture during those damp cold days and moisture condensing on the framework, they were shocked at how much rust and corrosion was present come spring. They were going to attempt to spray "undercoating" products over the rust to attempt to retard the progression. As we all may have experienced, spraying the available consumer products they tend to last a few years then get hard and peel off and retaining the moisture under the coating that suppose to protect the steel.

During the unfavorable weather that prohibited him from doing anything I offered my time to investigate "protectors" rather undercoating products. After several hours of researching for my friend I had found some real cool stuff. (not sure if I am allowed to disclose the product name on this site) Anyway, the product is a gel consistency and the main ingredient is lanolin. Ordered the product after speaking with the tech support and waited for delivery. Although the weather was still undesirable to apply I opened it up to see and feel what it was all about. I put some on my finger to find it liquefied as you agitate it and gelled again after about five minutes. I washed my hands about ten times and this stuff was still slippery on my fingers! Come to find, lanolin is not easy to remove from any surface.

Finally the weather broke and higher temps dried out the bottom of his rig. We bought an air assisted undercoating gun, $29.00 at HF(China mart). The product is mixed with a paint mixer to liquefy it so it can be sprayed. We began to spray to find it transparent and it leeches into the cracks and crevices that thicker products cant penetrate. Better yet, this stuff NEVER hardens so you can spray it on nuts, bolts, valves, connectors, brake lines,,,,, without the fear of "gluing" stuff together. We used 4.5 gallons to do the entire underneath on a 38', we didn't skimp. Final cost for the product was just under 160 bucks.

This product went over rust and soaked into the rusty surface. Gelled to a consistency of margarine.

I'll share this statement: I have never found a product that worked so well, a 12 on a scale of 1-10.

If you google rust prevention with lanolin it should find the website or private message me and I'll give you the name. NO, i have no interest in this company other than they make a super product and thought I would share the experience.

Travel Safe

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Old 01-25-2017, 08:43 PM   #2
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It will be interesting to see how it lasts when driving down the road, etc and how long it is recommended between applications.

Gordon and Janet
Tour 42QD/InTech Stacker
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Old 01-26-2017, 05:52 PM   #3
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To provide an answer, The product has been on since April, driven about 4,000 miles in rain, hot weather and mild weather. Hasn't shown any issues or changes in thickness since. I tested an old piece of very rusty 1018 steel, real cheap quality steel that rusts just looking at it, and applied over the loose rust. I then pressure washed it with water only, no "soaps". As of today it has not continued to rust sitting out in the weather. I'm not a chemist but I perceive the lanolin is what makes this product hold to the surface and provides the protection.
The world is full of opinions, this is only mine!
George and Diane, 2004 Discovery 39S pushed by our Keywest CC w/115 Johnson
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Old 01-26-2017, 06:27 PM   #4
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The Underside

Rust and corrosion are the result of oxidation. Undercoating that cracks allows oxygen to access the metal.
Salt will accelerate the deterioration.
If a compound can prohibit exposure to the air, it may be effective.
I'll standby
Dave and Nola, RVM1
The Journey is Our Destination!

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