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I think my corsera took 15 to 20 minutes on a dmt325 to be flat. Some are worse some are flatter when you get them. But after that, i havent really needed to flatten it but once.

Im with alpla.
The Norton just wont hold water and your spending a lot of time adding water even after soaking. I love the corsera 1k. It does the job in all aspects. And the way i see it, you wont...