PPGI & PPGL (prepainted galvanized steel & prepainted galvalume steel) e mohiotia ana ano ko te maitai i mua i te paninga, i te karaehe rino kua oti te whakakikorua i te tae, He hua i hangaia mai i te pepa rino wera-wera, te pepa wera-wera, te peera hiko hiko, me etahi atu. Whai muri i te maimoatanga o mua o te mata, kotahi, e maha ranei nga paparanga o te paninga waro ki runga i te mata, katahi ka tunua ka whakamaroke. He maama te taumaha o te karaehe whakakikorua i te tae, he ataahua te ahua, he pai te mahi anti-corrosion, a ka taea te tukatuka tika. Ka wehewehea te tae ki te hina, te puru moana, te whero pereki, etc.