Simply varying {HEAD ~ the time} of {TAIL ~ exposure} until the desired adhesion is obtained will lead to the best exposure time for the particular substrate and coating composition employed 
of
Simply varying { HEAD ~ the time } of { TAIL ~ exposure } until the desired adhesion is obtained will lead to the best exposure time for the particular substrate and coating composition employed
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH