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The cracks will simply depend on how deep they are.
When I took mine in, the guy behind the counter said, "nope, can't do it" before I even got half way from the door. He could see the cracks from there. I believe he said they couldn't be over an inch in length.
Either way though, the cost of a new one was only twice the cost of having it resurfaced. $35 vs $70. ish