DO NOT TRY TO REPAIR BLADES!!!
My former admin on here, Paulster2, learned this lesson the hard way. He didn't try to fix the blade, but he did try to spin it up with a cracked blade. The blade broke and flew off, hitting him 2" from his junk. And this was with a 450. With a 600, you are dealing with much more weight! I'm talking hospital time. JUST DON'T DO IT!
I know it's hard to swallow the price of these blades, but put yours and others safety in front of the price of the blade. Don't try to reglass them, don't try to glue them, the best thing you can do is cut them off about 4" from the root and use these as a short pitch gauge only blade.