Ka rite ki tetahi o nga whakairi whakataetae o te kamupene, ko to maatau HDG maka rino putunga putorino kotahi kua hangaia mo te whakamutu i te paipa e hiahiatia ana te nekehanga roa me te whakatikatika poutū. Ana kua nui te rongonui o te ao, tautautefito ki Amerika ki te Raki, Amerika ki te Tonga, Waenganui rawhiti me Ahia. Ano hoki, he rereke nga maimoatanga o te whenua hei kowhiringa maau: Maania, Hot Tuhia Galvanized, epoxy me Green oti piauau, kia ea ai o hiahia taumata anticorrosion o o reanga.