Me ka hoʻomohala ʻana o ka ʻepekema, ʻenehana a me nā ʻoihana, ua kau ʻia nā koi kiʻekiʻe no nā mea, e like me ka ikaika kiʻekiʻe, ke kūʻē ʻana i ke kiʻekiʻe wela, ke kiʻekiʻe kiʻekiʻe, ka haʻahaʻa haʻahaʻa, ka pale ʻana i ka corrosion, ke kūpaʻa ʻana a me nā mea ʻē aʻe kūikawā a me nā waiwai kemika, hiki i ke kila kila. ʻaʻole kūpono i nā koi.