Thanks for the tip Dan. After looking at the job i see that they only want 4 lines done so im a little relieved, before that i had tried walking away from the job (Twice!) due to my inexperience and even after explaining why, they still want the job done. I got thinking that using some sort of rubber mat to roll the sprayer on may help the “4-wheel drive” look a little bit , what do you think? i have also heard that cobblestones are often sealed and the latex may wear a lot sooner (or not even stick at all!) due to that and was recommended an oil paint instead.