PPGI ke poleiti ea tšepe e koahetsoeng (e nang le galvanized, aluminized zinc, nickel-plated, jj.) kalafo ea lik'hemik'hale tsa bokaholimo (ho tlosa mafura, phosphating, chromic acid passivation), ebe e koahetsoe ka pente, ebe e besoa ka lihlahisoa tse besitsoeng.

Melemo: e na le matla a mechini a poleiti ea tšepe le ts'ebetso e bonolo ea ho e bopa, 'me thepa ea tlhaho e na le mekhabiso e metle le ho hanyetsa mafome. Seaparo se na le ho khomarela ho matla 'me se ka boloka' mala o mocha nako e telele.

Kopo: e sebelisoa haholo kahong, lisebelisoa tsa lapengthepa ea ka tlung, libaka tsa sechaba le lipalangoang le masimo a mang.