I-PPGI yipleyiti yentsimbi egqunywe nge-coated (galvanized, aluminized zinc, nickel-plated, njl.njl.) unyango lwamakhemikhali oluphezulu (degreasing, phosphating, chromic acid passivation), emva koko igqunywe ngepeyinti, ize emva koko igqunywe ngeemveliso ezibhakiweyo.

Iingenelo: inamandla oomatshini njengepleyiti yentsimbi kwaye kulula ukuyibumba, kwaye izinto eziphilayo zinokumelana okuhle nokuhombisa kunye nokugqwala. Ingubo inamathela kakhulu kwaye ingagcina umbala omtsha ixesha elide.

Isicelo: sisetyenziswa kakhulu kulwakhiwo, izixhobo zasekhayaifenitshala, izibonelelo zikawonke-wonke kunye nezothutho kunye nezinye iindawo.