If you have a crack in the stone and it is too narrow to get either knife-grade or flowing epoxy into it you can use a penetrating epoxy. This glue will seep into a hairline crack, bonding everything it touches on the way down and into the stone. This glue will never get rock-hard.

What kind of epoxy do you use for stone?

Installation Product #17 Epoxy Adhesive for Bonding Stone Overlays typically uses the #17 Epoxy Stone Adhesive, and clean hard dry stone. A 3 gallon unit of Product #17 will typically mix with about 400 lbs. of stone.

Does resin stick to rock?

Resin art is very adaptable and can be used in so many ways. You can color with dyes, pigment powders, acrylic paint, alcohol ink, mica pigments, or just leave it as a clear finish. Using a resin will give your painted rocks a slick, smooth, glossy look.