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