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Plywood warping, will painting it when first bought stop the warping?

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Forum topic by lilliepond posted 02-13-2018 01:17 AM 368 views 0 times favorited 7 replies Add to Favorites Watch
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lilliepond

4 posts in 1462 days


02-13-2018 01:17 AM

Plywood warping, will painting it when first bought stop the warping?

Thanks for your time,
Richard


7 replies so far

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firefighterontheside

19274 posts in 2035 days


#1 posted 02-13-2018 01:27 AM

What kind of plywood? How are you storing it?

-- Bill M. "People change, walnut doesn't" by Gene.

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lilliepond

4 posts in 1462 days


#2 posted 02-13-2018 01:35 AM

Lowes Severe Weather 3/4-in Common Pine Plywood Sheathing. Storing it in the basement, wanting to cut for jigs to be used in un air-condition shop.

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firefighterontheside

19274 posts in 2035 days


#3 posted 02-13-2018 01:46 AM

I think that’s a sign it’s not a good candidate for woodworking jigs. Better to use hardwood ply which is more stable. Warping is usually from absorbing moisture on one side more than the other.

-- Bill M. "People change, walnut doesn't" by Gene.

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lilliepond

4 posts in 1462 days


#4 posted 02-13-2018 01:49 AM

Thanks

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LesB

1838 posts in 3621 days


#5 posted 02-13-2018 06:50 PM

Your description says it….”Sheathing”. This was made for sheathing under structural (house) siding or flooring. It was probably not kiln dried and was intended to be nailed to the side or floor of a structure so warping was not a consideration in it’s manufacture.

For jigs it is best to use multiply ply wood of various names such as Baltic birch, Russian ply, Scandinavian, etc.
Some AC or AB grade plywoods might also work.

-- Les B, Oregon

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Rich

3769 posts in 767 days


#6 posted 02-13-2018 07:08 PM

For any jigs or fixtures where absolute flatness is critical, like sleds, I use MDF for the base. I might use plywood or hardwood for some components, but the base is always MDF.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

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WyattCo

93 posts in 282 days


#7 posted 02-13-2018 07:48 PM

Severe weather plywood is treated just like treated 2×4’s, 2×6’s, etc. It’s soaking wet from the likes of BORG’s. As the chemicals dry, the wood, even the plywood, does a lot of moving.

If you’re going to use plywood for jigs, templates, etc, use interior grade material and stay away from pine at all costs.

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