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 a concrete wall or {TAIL ~ 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 a concrete wall or { TAIL ~ 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 OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL