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Spar Urethane for Pressure treated wood

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Spar Urethane for Pressure treated wood Charlie S. 06-21-2006
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Posted by Charlie S. on June 21, 2006, 9:55 pm
About a month ago we built a small 8 foot handicap ramp out of pressure
treated plywood. Didn't treat it with anything. We had a lot of rain.
Noticing a long of cracking going on along the vertical plane.

Also made side barriers using plywood. The porous sides face horizontally.
I'm getting a bit of warping already. Need to seal off the top. I have
some door weather strips I'm going to seal off the openings.

Found a can of Minwax Indoor/Outdoor Helmsman Spar Urethane in the cellar.
I was thinking of spraying it over all the surfaces. Probably give it a few
coats. Would this be the way to go or should I apply something else and/or
use a brush?








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Posted by m Ransley on June 22, 2006, 7:16 am
New pressure treated is wet, maybe 40%-50% moisture, wood need below 15%
to varnish. It can take months to dry, the only way to know is buy a
moisture meter. Varnish is not for pressure treated, stain is. Cracking
is normal for pressure treated, but your plywood was a mistake as its
interior grade im sure. Wait till its dry and stain it, forget the
varnish.


Posted by The Reverend Natural Light on June 22, 2006, 9:33 am
I built a new floor for an old truck bed out of pressure treated 3/4
plywood and covered it with many coats of spar varnish. Within months
it had all yellowed, cracked, and peeled. There has to be something
more suited to the application.

-rev



Charlie S. wrote:
> About a month ago we built a small 8 foot handicap ramp out of pressure
> treated plywood. Didn't treat it with anything. We had a lot of rain.
> Noticing a long of cracking going on along the vertical plane.
>
> Also made side barriers using plywood. The porous sides face horizontally.
> I'm getting a bit of warping already. Need to seal off the top. I have
> some door weather strips I'm going to seal off the openings.
>
> Found a can of Minwax Indoor/Outdoor Helmsman Spar Urethane in the cellar.
> I was thinking of spraying it over all the surfaces. Probably give it a few
> coats. Would this be the way to go or should I apply something else and/or
> use a brush?


Posted by No on June 22, 2006, 12:56 pm
Charlie S. wrote:
> About a month ago we built a small 8 foot handicap ramp out of pressure
> treated plywood. Didn't treat it with anything. We had a lot of rain.
> Noticing a long of cracking going on along the vertical plane.
>
> Also made side barriers using plywood. The porous sides face horizontally.
> I'm getting a bit of warping already. Need to seal off the top. I have
> some door weather strips I'm going to seal off the openings.
>
> Found a can of Minwax Indoor/Outdoor Helmsman Spar Urethane in the cellar.
> I was thinking of spraying it over all the surfaces. Probably give it a few
> coats. Would this be the way to go or should I apply something else and/or
> use a brush?
>

A varnish is no good for a deck. Its a lot of maintenance. Also,
pressure treated lumber is very wet and will crack, split and warp as it
dries. Normally for a deck, once it dries out. We recommend a
penetrating oil like Penofin or Sikkens. Plywood is terrible outside
(Not as bad as particle board) but will de-laminate when it gets wet.
Even "exterior" plywood will do this eventually.

I'm not sure the best think to do for your ply. Replace it with a
suitable material would be best. Aside from that. A good exterior primer
and paint may extend its life the best. For the pressure treated the
sikkens is available as a sold color stain that could be tinted to match
or compliment your color choice for the deck stain.

Good luck.

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