Treatment with the mild etching compound may be carried out for {HEAD ~ about 15 seconds} to {TAIL ~ about 5 minutes}, and is usually followed by a water rinse 
to
Treatment with the mild etching compound may be carried out for { HEAD ~ about 15 seconds } to { TAIL ~ about 5 minutes } , and is usually followed by a water rinse
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH