no? just scratch with mesh bedded. then top it a few days later. i said it as a 2 coat coz you said charge as a for 3 coat work. i didnt no if you meant coz of the extra material cost? but by the time youve bought sbr, scudded it, then fixed expamet, then bought sand cement waterproofer feb etc, and then scratched i wouldnt have thought the mat price would be much more depending on wall size obv, and its far less labour intensive. the ballache is the expamet tbh