Undercoat spray as moisture barrier inside? - Ford Transit USA Forum
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post #1 of 28 (permalink) Old 06-16-2019, 08:41:AM Thread Starter
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Undercoat spray as moisture barrier inside?

Any thoughts on using Rustoleum rubberized undercoat spray on the roof, walls and floor as a moisture barrier before I insulate???
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post #2 of 28 (permalink) Old 06-16-2019, 11:37:AM
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the msds is referring to the uncured product. at first glance I didn't see any warnings about the cured product.

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post #3 of 28 (permalink) Old 06-16-2019, 12:03:PM
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Where's all this moisture coming from? ventilate so you don't have to worry about it.

Isn't the van already painted inside?
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post #4 of 28 (permalink) Old 06-16-2019, 12:16:PM
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breathing while encapsulated in the van is causing much of the moisture. One of the solutions is to not breath in the van when the doors are closed. Another source of moisture is condensation, which is a product of physics; a form of science. A solution to that is to deny science, which is increasing in popularity these days.

But I agree, the factory primer and paint should be enough to keep the moisture from getting to the metal. If the wrong type of insulation is used (shredded jeans), it could soak up that moisture and cause mold and mildew issues, though.

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post #5 of 28 (permalink) Old 06-16-2019, 12:24:PM
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Don't people have roof vents? Crack a window open? Why is somebody sealing themselves in a van with no ventilation?

So someone sleeps in a sealed van with a vapor barrier and wakes up with 100% humidity with water dripping everywhere.

The OP should add a little more info.

IMO vapor barriers are unneeded if you ventilate.
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Last edited by phil; 06-16-2019 at 12:27:PM.
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post #6 of 28 (permalink) Old 06-16-2019, 12:28:PM
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some people are obsessed with maximum insulation and sacrifice all other aspects in that pursuit.
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2015 T250 MR cargo w/windows, 3.7, 3.73 Limited Slip. Purchased new 9/2016. Richmond, CA
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post #7 of 28 (permalink) Old 06-16-2019, 12:35:PM
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I hope they don't fart in that van
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post #8 of 28 (permalink) Old 06-16-2019, 04:22:PM
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The industry standard for airliners is LPS-3. "Spray-on paraffin"?
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post #9 of 28 (permalink) Old 06-16-2019, 06:21:PM
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The industry standard for pizza pans is spray oil.
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post #10 of 28 (permalink) Old 06-16-2019, 08:32:PM
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Quote:
Originally Posted by [email protected] View Post
Any thoughts on using Rustoleum rubberized undercoat spray on the roof, walls and floor as a moisture barrier before I insulate???
I am also thinking of using it on my floor before putting down the polyiso foam board insulation between 2"x2"s with sealed seams and the reflextix over my wall insulation also taped to the floor. Ceiling, walls, floor all connected by sealed vapor barrier. I think the undercoating or bedliner will be an additional small insulator and help if there is ever a plumbing disaster. Had not thought about walls and ceiling but worth considering. Will also have two Maxfans for ventilation and comfort, not planning on being where it is cold.... but if you want to make God laugh, tell him your plans. Good luck with your build.

2018 extended length
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3.5 ecoboost, 331 final drive
Limited slip
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