I want to do my kitchen backsplash using shards and other objects in it. What is the best adhesive to use?

I think you will find White Versabond Flex Fortified Thin Set Mortar to be your best choice. I have used it in many varied situations with great success. It comes in white and gray. I you think the white or gray color will conflict with your shards and assorted object, you can use powdered concrete coloring to adjust the color of the white thin set mortar to resemble the grout color.

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