all rendering is done with ordinary builders sand,if you use sharp sand it doesn,t stick as well.the pebble dash should be quite wet when thrown on to your backing coat of render or it wont stick.Cover everything that you dont want messing up as well.I usually put some PVA in with the mix to help adhesion and cracking.Dont do this job in hot sun or if there is a chance of a frost.ive been doing this for a living for 30yrs now.
phil holmes
November 2009