Pepala lopaka utoto la galvalume ndi zinthu zomangira zomwe zimapangidwa ndi zinthu zitatu zosanjikiza, kuphatikiza gawo lapansi, zokutira za zinc-aluminium alloy ndi zokutira za organic. Pambuyo pakupukuta pamwamba, phosphating ndi mankhwala amchere ovuta, amakutidwa ndi zokutira organic ndikuwotcha.Zinthuzo zimakhala ndi mawonekedwe athyathyathya komanso okongola, kulemera kopepuka, kukana dzimbiri, moyo wautali, ntchito yabwino yokana kutentha, yomwe imagwiritsidwa ntchito kwambiri pomanga, zoyendera, mphamvu yamagetsi, zida zapanyumba ndi zina.