Spray Foam is worth getting - Page 2 - Escape Trailer Owners Community

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Old 07-15-2016, 08:23 AM   #11
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Hummm, if you have a break in the spray foam and corrosion starts... are you going to easily see it and fix it before it becomes critical? If you don't need the foam for insulation (snow camping!), you might be better off treating the frame (right away) with a serious rust preventer.
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Old 07-15-2016, 08:45 AM   #12
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Most car manufacturers no longer recommend rust prevention systems as they now incorporate in the manufacturing the use of plastic, aluminum and other non corrosive materials. Trailer manufacturers do not follow the same regime. I myself like the foam for several reasons, if it also prevents corrosion, then that is an additional benefit. There has not been a length of time long enough in order to judge that quality, maybe in 10 years it can be determined.
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Old 07-15-2016, 09:24 AM   #13
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Ya, right. Take at look at the frame of my 2012 F150.

Donna, what is "serious" rust preventer?
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Old 07-15-2016, 10:22 AM   #14
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I was kinda thinking along the lines as Donna. What if salt spray works between the foam and the frame, the potential long term damage once discovered could be much worse. I would prefer open so I could visibly inspect the frame from time to time. If you think it's needed for insulation, ok, but don't think it would be a rust prevention technique.
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Old 07-15-2016, 10:46 AM   #15
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If there's a void in the foam that allows water to reach the frame, then theoretically it could cause corrosion you couldn't see - but, I don't think that's a compelling reason to get the foam or not get it. The main reason is cold weather camping and the insulation for the underside pipes and tanks that it provides.
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Old 07-15-2016, 11:18 AM   #16
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Boy there sure seem to be a lot of "what if" scenarios going on these days. Think I'll just enjoy my view, keep calm and keep on camping.

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Old 07-15-2016, 12:13 PM   #17
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Quote:
Originally Posted by cpaharley2008 View Post
Most car manufacturers no longer recommend rust prevention systems as they now incorporate in the manufacturing the use of plastic, aluminum and other non corrosive materials. Trailer manufacturers do not follow the same regime.
I don't think those other materials are the reason that they don't want you to goop up your car - after all, the floor panel and other lower structure on the vast majority of vehicles are still steel, even though bumpers and so on are polymer composites and the hood is aluminum. Even the aluminum-bodied Ford pickups have steel frames. I think the reasons are:
  1. they already do a better job of coatings at the factory, and
  2. sprayed-on goop plugs up drain holes, which traps water and causes more corrosion, particularly in fender areas.
I agree that trailer frames are not protected like motor vehicles, so there is some argument to add protection, although I still wouldn't use any of the aftermarket automotive "rustproofing" coatings.
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Old 07-15-2016, 01:40 PM   #18
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It's not like you can't see the frame if you have the spray insulation On mine I can see all the outside and bottom, as well as abut an inch, albeit with overspray, on the inside before you get to the foam. Guess that makes the foam about 3" think. Can't get much of a picture of it with the sun, but you should get the idea. After and before, before provided by ETI, same area but from a different angle.
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Old 07-15-2016, 02:35 PM   #19
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Great picture; that answers a lot for me! One other question. Does the black tank get a foam coating regardless of the under foam package or does it sit there like the picture? IIRC another post talked about spraying foam on the tanks anyway.
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Old 07-15-2016, 03:17 PM   #20
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Quote:
Originally Posted by SFDavis50 View Post
Does the black tank get a foam coating regardless of the under foam package or does it sit there like the picture? IIRC another post talked about spraying foam on the tanks anyway.
No.
  • The black waste tank sits on top of the floor, not exposed underneath, so it doesn't get foam in any case, and doesn't need it. The piping from the black tank is exposed under the floor, and only gets foamed if foam option is purchased.
  • If you don't get the foam under-floor insulation, there is no insulation applied under the trailer at all... not even tanks. That's normal - most RV tanks are just exposed, or above a cover but without insulation.
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