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Never try to curve a composite blade, (re)heating the the blade will cause the foam core to crumble and make the rest of the blade very brittle, i'd be surprised if it lasted more than 5 minutes before breaking.
I've got a mini blow torch that I use to curve my wood blades, it works well but takes kind of long to heat up. Once it's heated up, just wedge the blade under a closed door and have at it. Putting the blade in a vice also works well as long as the two sides have a little padding, but be sure you don't crank it down hard.
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