Thats right 4 cans per bottle,i race round the border to do a frame round job then start swinging can left to right moving backwards down job,that way i don`t splash up doors,borders and walls,it won`t make joints over 5mm hard remember so were there are curves or circles in the block the thick wedge shaped sand joints will stay soft..I done another one today and jetted a house roof to get the old roof tiles the same colour as the new extension ones,neighbour wants his doing,only the lower overhanging roof,they want to rent a cherry picker to do main roof as well,got to be money in that game.Dan