re: is it hard to reseal a sink to the underside of granite?

Mine also failed and I found the Hercules Sink Harness. Installation was not terrible with help from neighbor to hold sink up etc. you can get on Amazon for about $20. Don't think I'll ever have a problem with sink breaking loose again. You basically have little wire cables that go across corner to corner that you tighten and it holds the sink up. There's a video on their website explaining step by step installation. Braxton-Bragg.com