Warped MDF

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Forum topic by Knothead62 posted 08-04-2013 11:02 PM 1185 views 0 times favorited 8 replies Add to Favorites Watch
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2581 posts in 2569 days

08-04-2013 11:02 PM

Topic tags/keywords: mdf warped laminate countertop question tip

I have three pieces of countertop that were sink cut-outs. I got them out today to make a router table plus a couple of other things. I have had them for a while and notice that there is a slight bow in them- looking from the laminate side, they are concave. Is there any way to flatten them or do I need to scrap them? Thanks. Hopefully, I can salvage them.

8 replies so far

View Brit's profile


6945 posts in 2451 days

#1 posted 08-04-2013 11:30 PM

Not that I know of. Once MDF is warped, it is useless.

-- Andy -- Old Chinese proverb say: "If you think something can't be done, don't interrrupt man who is doing it."

View Dave57's profile


1 post in 1364 days

#2 posted 08-04-2013 11:58 PM

Once they are warped it is hard to get back flat. If they are only single sided laminate that is why they warped you must glue laminate on both sides to keep it from pulling into a warped panel. You can try and clamp down and add the laminate to other side and wait for glue to set but I would say you will never get them 100% flat.


View NiteWalker's profile


2736 posts in 2185 days

#3 posted 08-05-2013 01:40 AM

Brace the bottom with straight hardwood.

-- He who dies with the most tools... dies with the emptiest wallet.

View Dark_Lightning's profile


2712 posts in 2717 days

#4 posted 08-05-2013 01:45 AM

Seems like you could glue and clamp them to a straight piece of material that has a high sheer strength, like another sheet of MDF or good plywood. Maybe screws and/or glue. The stuff falls apart eventually, though, in tension.

-- Random Orbital Nailer

View kizerpea's profile


774 posts in 1976 days

#5 posted 08-05-2013 02:45 AM

Best thing to do is chunk the in the trash a forget u had them…sorry.. I hate mdf


View doubleDD's profile


5884 posts in 1651 days

#6 posted 08-05-2013 03:04 AM

Sorry to say, throw them away. Will not be worth the time and effort to save.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View Joseph Jossem's profile

Joseph Jossem

492 posts in 1877 days

#7 posted 08-05-2013 04:00 AM

Yup trash. Here in hawaii I have seen thousands of even new stuff turn to trash very fast because humidity

View Knothead62's profile


2581 posts in 2569 days

#8 posted 08-05-2013 09:44 AM

James101, it looks like MDF; may be particle board. Either, way it consists of tiny pieces of wood glued together. These are sink cut-outs from a cabinet shop. Will scrap them and start over. Thanks to all!

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