The substantially porosity free metallic coatings/layers/patches are applied to {HEAD ~ polymer or polymer composite substrates} to provide, enhance or restore vacuum/pressure integrity and {TAIL ~ fluid sealing functions} 
to enhance
The substantially porosity free metallic coatings / layers / patches are applied to { HEAD ~ polymer or polymer composite substrates } to provide , enhance or restore vacuum / pressure integrity and { TAIL ~ fluid sealing functions }
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