A surprising feature of the invention involves the discovery that while the coating compositions of {HEAD ~ the invention} are known to provide strong adhesive bonds to metal substrates, the same coatings have failed to provide {TAIL ~ bonds} of satisfactory strength on synthetic plastic substrates 
A surprising feature of the invention involves the discovery that while the coating compositions of { HEAD ~ the invention } are known to provide strong adhesive bonds to metal substrates , the same coatings have failed to provide { TAIL ~ bonds } of satisfactory strength on synthetic plastic substrates
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