A couple of years ago i had some indian flags laid on my driveway.
Did a great job but a couple of the flags have cracked and i want to replace them.
The problem is they used a porridge like substance that they squeegied into place ( it wasnt sand / cement mix)
I want to ensure i use the same grouting method again
a) what was the substance
b} where can i get some
The only chance we have is if you post a picture it sounds like either a compound or 2 part resin jobbie but so many out there it would be impossible to guess.