1.He pai te parenga o te waikura, te aukati i te waikura ma te sulfur dioxide, te 60% hydrofluoric acid, te waikawa acetic me te iti iho i te 80%, me te 15% ki te 65% te waikawa sulfuric.Ko te 140°C te pāmahana teitei e whakaaetia ana.
2.He ngawari ki te huri, ki te tarai, ki te weld ranei.Heoi ano, he ngawari ona ahuatanga, he ngoikore te kaha miihini, he kiato teitei, he iti te kawe waiariki.Mena e tika ana, me whakakikoruatia ki nga putorino rino hei whakanui ake i tona parenga pehanga.I te wa e whakauru ana, me whakauru ki roto i te waka rakau, ka tuu ranei ki roto i te waaawa i hangaia ki nga putorino rino wehea, ki te rino koki ranei, kia kore ai e pakaru me te paheke.