The cementitious substrate, particularly when concrete, may be any type of a floor, walk, driveway or other horizontal surface or any type of {HEAD ~ a vertical surface} such as {TAIL ~ a concrete wall} or any slanted surface 
The cementitious substrate , particularly when concrete , may be any type of a floor , walk , driveway or other horizontal surface or any type of { HEAD ~ a vertical surface } such as { TAIL ~ a concrete wall } or any slanted surface
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH