However, I have found it expeditious, and it is preferred, to coat {TAIL ~ the internal surfaces} of {HEAD ~ the reactor} after each polymerization run therein 
However , I have found it expeditious , and it is preferred , to coat { TAIL ~ the internal surfaces } of { HEAD ~ the reactor } after each polymerization run therein
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH