PPGI ndiyo yakavharwa ndiro yesimbi (galvanized, aluminized zinc, nickel-plated, etc.) pamusoro pemakemikari kurapwa (degreasing, phosphating, chromic acid passivation), yozoputirwa nependi, uye zvino zvakabikwa zvigadzirwa.

Advantages: ine zvose mechanical simba resimbi ndiro uye nyore kuumba mashandiro, uye organic zvinhu ane yakanaka kushongedza uye ngura kuramba.Kupfekedza ane adhesion yakasimba uye anogona kuchengeta novel ruvara kwenguva refu.

Chikumbiro: chinoshandiswa zvakanyanya mukuvaka, midziyo yemumbafenicha, zvivakwa zveveruzhinji uye zvekufambisa nemamwe minda.