Ikhoyili enamabala anemibala iwumkhiqizo weshidi elishisayo elinothayela, ipuleti le-zinc elishisayo, i-electrogalvanized sheet, njll., ngemva kokwelashwa kwangaphambili (ukukhishwa ngamakhemikhali nokwelashwa kokuguqulwa kwamakhemikhali), embozwe ngongqimba noma izingqimba ezimbalwa ze-organic coating ngaphezulu, futhi bese kubhakwa bese welapheka.Inesisindo esincane, ukubukeka okuhle nokumelana nokugqwala okuhle, futhi ingacutshungulwa ngokuqondile.