sealing plywood

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PaipoRick
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sealing plywood

Unread post by PaipoRick » Tue Feb 07, 2012 4:46 pm

What do you guys recommend for sealing non marine ply? I am going to make a few plywood boards from some 3/8" that isn't marine grade....I don't want to spend a lot on marine ply (at least not yet).

We need a faq for that stuff.

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Re: sealing plywood

Unread post by mrmike » Tue Feb 07, 2012 6:02 pm

HOUSE PAINT

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ClanB
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Re: sealing plywood

Unread post by ClanB » Wed Feb 08, 2012 12:05 am

I used krylon spray on mine ,no clear coat and after 4 sessions I can see the grain of the wood swelling and the nose kick has flatened out a bit.

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Re: sealing plywood

Unread post by Poobah » Wed Feb 08, 2012 5:45 am

It depends on what you mean by sealing. A sealer can just be a thinned down version of the finish paint or varnish that you want to use. I've also used hemp or linseed oil as a primer coat under oil-based varnish. I like the fast-drying Minwax Polyurethane...mainly for the way it sands between coats. I don't bother to thin the first coat with that stuff. A slower drying (and more expensive) spar varnish might be a good choice since your plywood is thin enough to be flexy. A quart goes a long way.

Ecologically the best choice is to use whatever you already have in the garage, or whatever is free or cheap on Craigslist.

I checked the Free section on the Ashville Craigslist, and only found one old ad for a guy giving away four gallons of white exterior paint. Also saw some free plywood in a couple of ads. For a solid timber board, you could snag these headboards for free:

http://asheville.craigslist.org/zip/2833152502.html

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Re: sealing plywood

Unread post by GeoffreyLevens » Wed Feb 08, 2012 12:19 pm

Quick and dirty for experimental boards-paraffin driven in w/ heat gun or stolen wife's hair dryer. Be sure to get plenty into the edges/end grain parts.

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Re: sealing plywood

Unread post by Uncle Grumpy » Wed Feb 08, 2012 2:49 pm

These days only the very cheapest plywoods are not made with waterproof glue.
Many exterior and all marine plys are water and Boil proof.
The benefits of marine ply are: more layers, thicker face veneers and no voids.
Certain types (okume) are also very light.
If you are seeking longevity, a coat of epoxy (especially on the edges) makes a great primer for most paints.
It also goes on better with a little warmth applied via heat gun or hair dryer after you roll or brush it on.
You have to sand it lightly before you paint BTW.
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Re: sealing plywood

Unread post by Atlantasurfer » Fri Feb 10, 2012 12:05 pm

I use good old Helsman spar urethane. A couple of coats gives you a really smooth surface.

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