1 part cement 4 parts sand ......... use plasticiser in mix if you have it
(or add some fairy liquid to the water - lowers surface tension and entrains
air)

I would suggest wire brushing well before hand and damp down surface and
mating face of coping with a mix of unibond & water.

Rick
"Arthur" wrote in message
...
Hi all.
I have to reset some of the heavy coping stones on the low wall
outside of my mid-terrace (10" wide and 9" high)
What sand to use and ratio to mortar will I use?
And any particular technique I should use?

Thanks

Arthur