1. Ua ntej, siv cov kuab tshuaj los ntxuav lub ntsej muag ntawm cov hlau thiab tshem tawm cov organic teeb meem ntawm qhov chaw
2. Tom qab ntawd siv lub cuab yeej (xov hlau txhuam) tshem tawm cov nplais xoob lossis tilted, xeb, vuam slag, thiab lwm yam.
3. Siv txoj kev ntxuav cov kua qaub.
Galvanization yog muab faib ua kub dip thiab txias dip. Kub dip yog tsis tshua muaj rusting, thaum lub caij txias dip yog ntau rusting.