Undercoating options (plywood)

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Undercoating options (plywood)

Postby peterlevins » Sun Dec 15, 2019 7:38 pm

Time has come to prep the underside. After much research, I was set to use a top quality house paint and primer but the more I think, the more I question myself. So, I’m posting to see what the popular method is. Image


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Re: Undercoating options (plywood)

Postby Woodbutcher » Sun Dec 15, 2019 8:04 pm

Check out this thread that is running now on the same subject. It says Flour, but he meant floor.

viewtopic.php?f=21&t=72285
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Re: Undercoating options (plywood)

Postby peterlevins » Sun Dec 15, 2019 9:47 pm

Woodbutcher wrote:Check out this thread that is running now on the same subject. It says Flour, but he meant floor.

viewtopic.php?f=21&t=72285


Cool, thanks


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Re: Undercoating options (plywood)

Postby printer » Thu Dec 19, 2019 11:07 am

I bought a gallon of Tremclad rust paint for the frame, should have just bought a quart. But needing to paint the bottom of the floor I used the rust paint. It is an oil based paint and seems to stick well enough on wood. Many years ago I used some on monitor speakers for a band, it took a beating. I am putting foam underneath the floor and it was more for moisture proofing than anything. If anything I would go for an oil based paint.
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Re: Undercoating options (plywood)

Postby GPW » Fri Dec 20, 2019 6:03 am

Has the Black Nasty stuff fallen out of favor ..??? Roofing cement … :thinking:
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Re: Undercoating options (plywood)

Postby peterlevins » Fri Dec 20, 2019 6:44 am

GPW wrote:Has the Black Nasty stuff fallen out of favor ..??? Roofing cement … :thinking:


Seems many are still using it but house paint etc are just as popular


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Re: Undercoating options (plywood)

Postby booyah » Fri Dec 20, 2019 8:01 am

I opted for black beauty fence post paint. Figure if its supposed to protect fence posts in the ground from moisture it will work for the bottom of a camper. Then i added insulation below that. 5 years and thousands of miles this spring and so far so good
My build, 5x8 modified benroy "Smiles to go". Started April 2nd 2015, first trip August 2nd 2015.

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Re: Undercoating options (plywood)

Postby BaldJoey » Thu Jan 09, 2020 9:18 pm

I'm almost to ubdercoating. Im thinking about truck bed liner. Any thoughts?

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Re: Undercoating options (plywood)

Postby peterlevins » Thu Jan 09, 2020 9:21 pm

BaldJoey wrote:I'm almost to ubdercoating. Im thinking about truck bed liner. Any thoughts?

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I went with an oil based primer and 3 coats of gloss latex
The wood can expand and contract and breathe


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Re: Undercoating options (plywood)

Postby BaldJoey » Thu Jan 09, 2020 9:24 pm

Anything special you did to fasten your footwell?

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Re: Undercoating options (plywood)

Postby peterlevins » Thu Jan 09, 2020 9:26 pm

BaldJoey wrote:Anything special you did to fasten your footwell?

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Glued and screwed. Tight fit is key


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Re: Undercoating options (plywood)

Postby BaldJoey » Thu Jan 09, 2020 9:27 pm

3/4" marine grade ply?

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Re: Undercoating options (plywood)

Postby peterlevins » Thu Jan 09, 2020 9:29 pm

BaldJoey wrote:3/4" marine grade ply?

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Marine ply is not necessary for builds. Same glues are used. I used 3/4 AC ply. The oil base primer seeps in to the wood


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Re: Undercoating options (plywood)

Postby BaldJoey » Thu Jan 09, 2020 9:30 pm

Cool, Thanks!

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Re: Undercoating options (plywood)

Postby peterlevins » Thu Jan 09, 2020 9:33 pm

BaldJoey wrote:Cool, Thanks!

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Some even go bare wood for the bottom. Good prep and paint is all you need.
They all say, it rots from the top down so floor is the least in need of coating


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