How can I flatten hardboard?

[Bob Stroupe]

I have a piece of 1/8" hardboard that has a curve along one edge and won't lay flat like I need it to. I tried laying it on a flat surface and throwing weight on top of it for a couple of days and there doesn't seem to be any change in its shape.
How can I flatten hardboard ?
Thanks

[Myk Rian]

Glue it down, or use brads.

[John Thompson]

AT the price of hardboard... I would just chalk it up and replace it. I can't recall seeing hardboard curl as you describe so there may not be an abundance of solutions available but... the good news is it's cheap relatively speaking.

Good luck...

[Prashun Patel]

+1. You flatten hardboard by buying new hardboard and putting the 'warped' piece in your bin for 'future template stock'

[Tony Shea]

It must have received moisture in certain areas to cause the warping. +1 on buying a new peice. The only thing that I could think of to try but may ruin the peice is use water and weights. Could cause some bubbling issues like MDF therefore may be a lost cause. Just buy a new peice.

[Peter Aeschliman]

I've had hardboard warp on me when I leaned it up against the wall for a few weeks and left it. The problem was that I didn't lean it at enough of a vertical angle, so it started to sag.

I too would just replace it.

[glenn bradley]

+1 on replacement. I had a piece of non-tempered HB that had some curl. Screwed it down and years later when I took the screws out; it curled just like before.