ʻO nā ipu kanu kahi mea hana nui no ka ulu ʻana o nā mea kanu ʻōmaʻomaʻo. He kaiapuni ko kela mea keia mea kanu no kona ulu ana. Inā kanu ʻoe iā lākou i loko o nā ʻano ipu like ʻole, e hana lākou i nā hopena like ʻole. ʻO nā ipu pua kila Corten he corrosion-resistant, ʻoi aku ka lōʻihi o ka lawelawe ʻana a me ka pua nani. Hiki ke hoʻopilikino ʻia ke ʻano a me ke kala o ka ipuhao e like me nā koi, a hiki ke hoʻohana ʻia no ka hoʻonaninani o waho, ka hoʻonaninani pā, etc.

Hāʻawi ka ipu kanu kila Corten i kahi hiʻohiʻona ʻulaʻula ʻulaʻula ʻulaʻula e loli ana me ka wā a me ka manawa, e hana ana i ka haʻalulu ikaika me nā mea kanu ʻōmaʻomaʻo, e hoʻomohala ana i kahi ʻano kūlohelohe.