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

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

by lilliepond
posted 02-13-2018 01:17 AM


7 replies so far

View firefighterontheside's profile

firefighterontheside

20636 posts in 2398 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.

View lilliepond's profile

lilliepond

4 posts in 1825 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

20636 posts in 2398 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 1825 days


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

Thanks

View LesB's profile

LesB

2221 posts in 3984 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

View Rich's profile

Rich

5001 posts in 1130 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.

View WyattCo's profile

WyattCo

93 posts in 645 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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