<span>I used some Slablayer to lay new paving slabs, following the instructions on the bag; although the mortar set firmly as a mortar layer underneath the slabs, it did not adhere to the slabs - there was a sandy layer on top of the mortar. </span><span>I emailed to Lafarge (also pointing out that the instructions could be better:</span><span>a) Should less water be used (instruction 3 is vague &