Originally Posted by mr4speed
Are you guys reffering to the big yellow plastic 3M long board pt# 05444. Hope that you had better luck with yours than I did with mine. Brand new right out of the box I started blocking with it, and something just did'nt seem right. I put it on a straight edge and found that the center of it was in almost a 1/16 of an inch. I would have been better of using the box it came in as a block. If I remember correctly it was about 60-70 bucks with shipping quite a few years back. At that point I had just about given up on these store bought blocks and just made all my own.
I think you got a bad one. I got mine for $2 at a swap meet. It's perfectly flat. I also leave crap on the edge of tables and I already warped a few aluminum blocks but this thing stays straight. Maybe you can clamp to a straight edge and throw it in the oven.