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Old 11-12-2018, 03:01 PM   #1
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Undercoating a Travel Trailer

With some recent projects I've been spending a lot of time under my trailer. While lying on my back and looking at the bottom I noticed that only the center portion between the frame members appears to be "Water Resistant". The plastic cover looks like it would provide a pretty good barrier to any water and road chemicals tossed up from a wet road from reaching the water sensitive pieces (anything wood).

On either side of the frame the floor is covered with a fabric that doesn't look quite as water resistant. In fact it looks just like the landscape fabric one puts down before they make a flower garden to keep weeds from sprouting.

My question(s):

Is this fabric truly water resistant (I'd say water proof but that would imply that NO water would pass through) or if driving in a rainstorm does it allow water to migrate through?

Has anyone ever sprayed any of he rubber based undercoating materials over the fabric type underliner to make sure no water migrates up into the floor and whatever insulation that might be there?

I live in an area noted for its rainstorms and in October I encountered a lot of rain in Wyoming where it's not noted for rain. Since I like to travel regardless of season and want to make sure I have no "bottom up leaks" is undercoating a viable option. I have already sealed the plastic panel around the edges with aluminum tape so it's pretty much handled. My thoughts are now focused on sealing the rest of the underside with special attention in the wheel well areas.

Anyone been down this path before?
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Old 11-12-2018, 03:14 PM   #2
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If you could just spray it on the frame but on anything else I would think it would gum everything up
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Old 11-14-2018, 09:08 PM   #3
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I would also be concerned about it not drying out due to impeding air movement if you made it more water resistant. Water in itself isn't harmful. It's when something absorbs water and stays wet with no where for it to go or no way for it to dry out.
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Old 11-14-2018, 09:56 PM   #4
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One of the first things I did when I got my new hybrid home back in May 2014 was to tie up the hanging brake wires and tank sensor wires covering them using a couple of different sizes of wire loom I got at HFreight then using cable ties to make a neater and less hanging install. I also have that crinkled plastic under floor you describe.

I then used about 6 large 16 oz cans of spray-on undercoating, covering all the brackets and metal on the underside, and also the metal exposed in the wheel wells. I covered that area pretty well as I recall. Four years later, as I crawled under this summer I did not see any problems developing from moisture... and I live in the Ohio River valley near the Licking river 2 miles away... lots of moisture in the air most of the year...
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Old 11-15-2018, 03:51 PM   #5
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Spray this stuff all over anything that can corrode.
https://www.krown.com/en/products/ae...ion-lubricant/
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Old 11-16-2018, 01:45 AM   #6
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At a seminar in Goshen last summer, I asked about coating the wheel well area with undercoating to provide some protection against a tire failure. The presenter thought it was a good idea. Haven't gotten my butt in gear yet to actually do it though....
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Old 11-17-2018, 01:46 AM   #7
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Quote:
Originally Posted by Brickie View Post
Spray this stuff all over anything that can corrode.
https://www.krown.com/en/products/ae...ion-lubricant/
Something else that is pretty effective is the Amsoil Heavy Duty Metal Protector. I use it on frames and such with my heavy commercial equipment. Doesn't harm wiring or plastic components.
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Old 11-21-2018, 01:36 PM   #8
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After a blowout on the front right of my 5er, the fabric was ripped out and I could see the wood chip underlayment of my floor. I sprayed a can of black rubber paint over the area, probably 9" x 30". When I got home, I sprayed a second can of the stuff and just before i screwed the diamond plate to the area, I emptied a can of foam in the space. Hope this will keep the floor from getting soft...
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