Hello lacajunman1950. Thank you for your question. We recommend using Flex Bond thin set mortar or VersaBond Thin Set mortar or Natural Stone and Large Tile Premium Mortar. All of them good for installation. Please note. If you want the seams between the tiles to be white, you need to use the white thin set mortar, if you want gray seams between the tiles, use the gray thin set mortar set appropriately. We hope, our advice will help you. Sincerely, Delap.

I have a kitchen bar I'm installing this flex stone under it what can I put on the stone to keep the knees from kicking the grit off of it ? Is there a sealer, spray to stop it from falling off? Thanks