Undercoating a motor home

[Piker]

My vote is for a product like fluidfilm... It's like an oil that soaks into the rust and down into all the little cracks and crevices and then tacks up a bit. Makes it a little dirty to work on the undercarriage, but it does work well to slow down and prevent rust.

Around here, lots of people just have the underside of their cars oiled every year. I've used a mixture of oil and boiled linseed oil before, which works well but is a little more like paint. Lots of options for sure. Don't think I would ever put a rubberized undercoating on an already rusty chassis.

Best thing to do is keep your rv off of the salt covered winter roads. Although just sitting in the garage, I've noticed ours will see new rust here or there underneath. I oil it or fluid film it even though we don't use it in the snowy months.

Cheers

[Piker]

Actually something I like better than fluidfilm is a Blaster product called Corrosion Stop. It's a marine grade corrosion inhibitor. Home Depot has it, but I've never seen it in anything other than a spray can.

Cheers

[Mr_D]

My CC came factory undercoated although some has been lost due to rocks and road debris. I bought a can of undercoating to touch it up.

[ModestMonk]

Originally Posted by paintergirl

Thanks for your thoughtful reply. This is a 15 year old gas FWD unit and there is corrosion as you suggest. I will pass your comments on to the MIC (mechanic in chief aka my husband).

Short of a restoration, you'll want to do two things.

The corrosion needs to be addressed first. A good wire brushing to remove the scaling rust. Then an encapsulator such as POR 15 or even Rustoleum. It will block oxygen from the rust and shed the water.

As stated already products like Fluid Film are a seasonal answer to the component coverage area's. Fluid Film is lanolin based and will wear off based on exposure.

The Ole' Canadian answer of a mix of linseed oil and oil applied periodically would further protect the supporting components longer than Fluid Film.

I don't believe you can apply and forget it. There's too much money invested to not stay on top of this persistent issue.

[RobertK]

Fluid Film on all my vehicles also.Try Kelsport for FF and spray equipment.I also use it on battery connections.

[veraken]

Originally Posted by ModestMonk

Short of a restoration, you'll want to do two things.

The corrosion needs to be addressed first. A good wire brushing to remove the scaling rust. Then an encapsulator such as POR 15 or even Rustoleum. It will block oxygen from the rust and shed the water.

As stated already products like Fluid Film are a seasonal answer to the component coverage area's. Fluid Film is lanolin based and will wear off based on exposure.

The Ole' Canadian answer of a mix of linseed oil and oil applied periodically would further protect the supporting components longer than Fluid Film.

I don't believe you can apply and forget it. There's too much money invested to not stay on top of this persistent issue.

I agree. I used a product called Chassis Saver. You still have to wire brush and remove all loose rust. I found that Chassis Saver was easy to apply and did not need the prep coat. Since it was under the MH, I was not concerned with UV protection.

[aswit0001]

Wandering about undercoating also but for sound reduction inside coach.

[BFlinn181]

Originally Posted by aswit0001

Wandering about undercoating also but for sound reduction inside coach.

You don't have RV info in a signature, you might want to add that through the "User CP" in the top left of page.

For most Class A RVs, undercoating would do little to reduce sound because the actual floor of the RV is hidden by compartments, tanks, etc. I wouldn't think sound reduction to be a major reason for undercoating.

[nehog]

Personally I'd suggest Fluid Film, applied carefully to avoid anything that should not be coated (on my bus, apply only to the exposed frame and such).

[Soppy]

I use rust check on mine. You have to apply it every year. It also helps keeping small rodents out.