PPGI ndi mbale yachitsulo yokutidwa (yokutidwa ndi galvanized, aluminized zinc, nickel-plated, etc.) mankhwala a pamwamba (degreasing, phosphating, chromic acid passivation), kenako yokutidwa ndi utoto, kenako zinthu zophikidwa.

Ubwino: Ili ndi mphamvu ya makina ngati mbale yachitsulo komanso yosavuta kupanga, ndipo zinthu zachilengedwe zimakhala ndi kukongoletsa bwino komanso kukana dzimbiri. Chophimbacho chimakhala cholimba kwambiri ndipo chimatha kusunga utoto watsopano kwa nthawi yayitali.

Ntchito: imagwiritsidwa ntchito kwambiri pomanga, zida zapakhomomipando, malo ogwirira ntchito za anthu onse ndi mayendedwe ndi minda ina.