Letlapa la galvalume le entsoeng ka mebala ke thepa ea mohaho e entsoeng ka lisebelisoa tse tharo tse kopantsoeng, ho kenyelletsa le substrate, zinc-aluminium alloy coating le organic coating.Ka mor'a ho hloekisa holim'a metsi, phosphating le phekolo e rarahaneng ea letsoai, e koahetsoe ka ho roala ka manyolo le ho behoa.Boitsebiso bo na le ponahalo e bataletseng le e ntle, boima bo bobebe, ho hanyetsa kutu, bophelo bo bolelele, ts'ebetso e ntle ea ho hanyetsa mocheso, e sebelisoang haholo ho haha, lipalangoang, matla a motlakase, lisebelisoa tsa lapeng le masimo a mang.