Please choose the correct solution to the question: Glue stones together

Solution1: Using a piece of fine grit sandpaper rough up the area of stone you need to glue,Use a  few dabs liquid epoxy on the bottom of a stone and apply to another stone

Solution2: Using a piece of fine grit sandpaper rough up the area of stone you need to glue,Use a  few dabs liquid epoxy all over a stone and apply to another stone

Answer format: solution1/solution2