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Old 08-24-2008, 08:10 AM   #1
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Plywood sealer

Putting down new 3/4" AC plywood floor on my 55 Safari and would like to know what would be a good sealer to seal the ends and the bottom of the plywood................thanks
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Old 08-24-2008, 08:12 AM   #2
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If you put marine plywood in you won't have to worry about it...

Behr makes a log home sealer that would probably work really well... You can get it at Lowes or Homedepot.
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Old 08-24-2008, 08:28 AM   #3
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Quote:
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If you put marine plywood in you won't have to worry about it...

Behr makes a log home sealer that would probably work really well... You can get it at Lowes or Homedepot.
Hi Jason; Why would you not seal Marine plywood? Plywood is plywood no matter what, it needs to be sealed. Thanks, "Boatdoc"
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Old 08-24-2008, 08:38 AM   #4
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Good question, not sure, they say "well I was told, and I have been wrong before" That the marine ply is sealed as it is built... But then again sealing it even more won't hurt it at all...

They make all kinds of sealers for wood ,but that log cabin stuff is heavy duty stuff... My neighbor has a log cabin with it on... He built a green house that was portable "ie on wheels so he could move it around" He coated the floor and the holes he drilled through the floor with the stuff for water to drain out.. 2 years now and no problems...
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Old 08-24-2008, 08:39 AM   #5
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According to Dr. Rot this is the best, but very expensive.
http://www.rotdoctor.com/test/plywood/plywood.html
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Old 08-24-2008, 08:46 AM   #6
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Man, thats some serious stuff... I have seen epoxy poured over tables with photos under them... That would work for sure.... But how much is you sub floor is gonna be exposed to water? If the $ doesn't matter sure.... But I bet you have to wear a heavy duty mask with the smell that stuff will put off...
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Old 08-24-2008, 08:47 AM   #7
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All of the one-part products, are second rate at best. The best long term protection, will come from a two part penatrating epoxy sealer, such as is available from this site: rotdoctor.com, when the wood won't soak up any more, then apply a coating of regular epoxy, such as West System, or System Three. The time and materials involved in laying new plywood are to great of an expence to not seal with an effective product(s).
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Old 08-24-2008, 08:50 AM   #8
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I used West System epoxy with the slow hardener. I did the edges and about 4" from the edges, and all the joints.

Didn't do the entire underside.
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Old 08-24-2008, 09:07 AM   #9
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I agree that you do need to seal marine grade plywood. Having owned a few wooden Chris Craft cruisers, I became very well versed in marine adhesives, sealtants, coatings and epoxies. All of which are very applicable to Airstreams.

I originally used Smith's CPES but have since switched to this company's clear penetrating epoxy sealer. I soaked all of the plywood floor on the 55' Cruiser prior to installation, then applied a heavy bead of 3M 5200 adhesive to the cross members and frame for a waterproof joint between the steel and wood and to seal around the fasteners.

http://www.epoxyproducts.com/1_marin...ml#PENETRATING

their website is hard to navigate, but their products are worth trying.
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Old 08-24-2008, 09:29 AM   #10
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I do a lot of wood restoration and recommend Liquiwood , an industrial product used in architectural work. It is available from a company called Abatron in Kenosha , Wi (you can check out their web site for more information). As a second choice I would go with one of the West products.
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Old 08-24-2008, 09:53 AM   #11
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I do a lot of wood restoration and recommend Liquiwood , an industrial product used in architectural work. It is available from a company called Abatron in Kenosha , Wi (you can check out their web site for more information). As a second choice I would go with one of the West products.
Would you know how much a quart would cover, there is a company 5 miles from my work that handles it............thanks
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Old 08-24-2008, 12:18 PM   #12
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I originally used Smith's CPES but have since switched to this company's clear penetrating epoxy sealer. I soaked all of the plywood floor on the 55' Cruiser prior to installation, then applied a heavy bead of 3M 5200 adhesive to the cross members and frame for a waterproof joint between the steel and wood and to seal around the fasteners.

http://www.epoxyproducts.com/1_marin...ml#PENETRATING

their website is hard to navigate, but their products are worth trying.
I agree that CPES - Clear Penetrating Epoxy Sealer - would be the deal for preserving the marine plywood in your Airstream. Bedding it in a marine sealer like Sikaflex would also help to keep everything water tight, but it will be very difficult to take up the flooring.

Marine ply is qualified for minimum voids in the plies, and for the adhesives used. But it isn't sealed, since the builder must decide what finish is applied.
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