Its a 500 sq ft stamped concrete patio that was cut and dug up in 2 big spots to fix broken pipes. I want to apply approx 2" thick pea mix on top of it. Will i need a bonding adhesive like this? https://www.homedepot.com/p/Quikret...ERCH=REC-_-pipsem-_-100318541-_-100318465-_-N Any other thoughts would be nice. Its my first time doing one.