Undercoating Recommendations - Fiberglass RV
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Old 12-23-2020, 12:34 AM   #1
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Undercoating Recommendations

Hello... I was under my 2001 Scamp19 and saw that some sections are OSB board. I assume that because there is absolutely zero rot, they must have been treated when the trailer was built. But I want to either coat it again or for the first time.



In either case, what does anyone recommend?? That Flex Steel stuff from TV, regular car undercoating, rhino liner, just primer and paint?


thank you
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Old 12-23-2020, 01:31 AM   #2
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I think that because it is exposed to the air it is allowed to dry and thus not rot.
If you seal it, you can trap moisture.
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Old 12-23-2020, 07:37 AM   #3
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Rots from the inside out. Being exposed to the outside allows easy inspection and a chance for it to dry out. Be glad it is exposed.

Anything that traps interior water promotes rot.

Where does the water come from inside? Leaks around windows and vents that enter into the trailer as well as plumbing.
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Old 12-23-2020, 07:46 AM   #4
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Scamp coats the underside of the OSB floor with fiberglass resin. It seems to be pretty long-lasting, and in my opinion your maintenance time and budget would be better spent on resealing windows, vents, and other potential leaks from above that are the usually culprits in floor rot.

If you do decide to renew the coating, Id add another layer of the same, making sure everything is thoroughly clean and dry. Messy job, since youll be doing it upside down!
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Old 12-23-2020, 08:15 AM   #5
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Quote:
Originally Posted by Bfleissner View Post
Hello... I was under my 2001 Scamp19 and saw that some sections are OSB board. I assume that because there is absolutely zero rot, they must have been treated when the trailer was built. But I want to either coat it again or for the first time.



In either case, what does anyone recommend?? That Flex Steel stuff from TV, regular car undercoating, rhino liner, just primer and paint?


thank you

I put a new floor in my old conventional camper and coated it with CRC Undercoat. https://www.crcindustries.com/produc...-oz-05347.html

I had bare exterior grade plywood and steel screws I was covering. It did a nice job. I would do at least the frame. I don't think it is so water proof that it would trap water. I don't know use it on the frame and then decide. It is very messy. Wear old clothes and a good mask, and watch the wind.
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Old 12-23-2020, 08:21 AM   #6
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I agree about the frame. POR-15 seems to be the go-to product for that.
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Old 12-23-2020, 12:20 PM   #7
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“Since there is absolutely zero rot”. How about, “If it ain’t broke, don’t fix it !!”
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Old 12-24-2020, 01:57 AM   #8
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Thanks guys.. You all just saved me some money and some time. I'll just let sleeping dogs lay
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Old 12-24-2020, 08:20 AM   #9
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My 2010 Trillium started to show signs of rust on the frame after a few years. I looked at POR 15 and decided that application on my back under the trailer would have been difficult so I settled for Rustoleum rusty metal primer coated with Rustoleum satin black paint. Seven years later its holding up fine. Less prep and it's easily removed with paint thinner. Using POR 15 I would have looked like a Holstein for a long time.
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Old 12-30-2020, 06:13 PM   #10
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Originally Posted by Jon in AZ View Post
Scamp coats the underside of the OSB floor with fiberglass resin. It seems to be pretty long-lasting, and in my opinion your maintenance time and budget would be better spent on resealing windows, vents, and other potential leaks from above that are the usually culprits in floor rot.

If you do decide to renew the coating, Id add another layer of the same, making sure everything is thoroughly clean and dry. Messy job, since youll be doing it upside down!

I used just spray rubber undercoating where the resin seems to be bad. So far that seems to be working. Yeah I had some that had rotted out, but has has beem mentioned here that was where there was a leak. In this case the plumbing.
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