I am trying to find out what is the exact procedure and system for preparing, mixing, laying and then patting down sandwash.

I am not proposing in doing this myself, but I am trying to find how it should be done, following my recent experience from somebody who said they could do it.

Finally can anyone recommend someone in Phuket, and if so how much did they pay per square for removing the existing, and then laying the new please?

Look on You tube>  I used sandwash on my front porch and stairs way back in 2001 in Kamala