Outdoor Countertop

I have granite counter tops on my out door bar in direct California sun. Surfaces are dark and get very hot, even when shaded. The bull nose lamination (rounded edges) are separating and in some cases have completely fallen apart. I need an adhesive to restore the laminated edge (top to the bottom)that can withstand high temperatures of approx. 160 to 180 degrees. I don't know if there is a perfect adhesive for granite to granite application for high temparatures, but I would just like your best suggestion. Thanks in advance.