Un-warping a stack of plywood

So I had purchased a couple sheets of 4 by 8 Baltic birch plywood which I had cut down to size for the machine. I didn’t realize until afterwards that some of them are a little bit warped. I have been storing them all flat and was thinking applying some moisture to them would fix them. Any tips or tricks on this? Should I stack them all on top of each other once moistened? How long does it take for it to be fixed? Haha thanks guys.



Hi Jeremy,
I cut mainly Baltic birch on my scroll saw. I got some 1/8 inch that I was making18x7 pencils that warped really bad. I got them moist, stacked them on top of each other and put a board on top, and placed heavy bricks evenly across the top. I let it sit for a week or so, and they were fine. Lisa H


Ha! That’s a new one to me.

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I just had an idea that i think would work well. getting two scrap pieces of granite counter top from a countertop company that are around the size of the glowforge bed and putting the BB in between them to flatten. They are typically very flat and heavy enough to flatten.


I have some warped plywood (and some proofgrade, actually) that is 1/8 thick. I’m lazy, so I actually just tape it flat to the crumb tray. Then, when I glue my layers together, I flatten it all under a couple of books or use lots of clamps. That has flattened everything out nicely so far.


No good with big sheets, but I’ve taken warped chipboard from Hobby Lobby AND warped hardwoods from Inventables, and placed them in a stack of acrylic for flattening.