{HEAD ~ The primer coating} chemically bonds to {TAIL ~ the polymer substrate} by developing covalent bonding or cross linking with the substrate 
chemically bonds to
{ HEAD ~ The primer coating } chemically bonds to { TAIL ~ the polymer substrate } by developing covalent bonding or cross linking with the substrate
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH