Ko te whariki whakaraerae toru-ahu te whariki he whariki ngawari, he maamaa e toru-ahu te hanga mai i te tino kaha o te UV whakapumau i te matua polymer e whai ana mo te whakamarumaru o te mata o nga pari, te whakamarumaru i te horo oneone ranei, hei whakaiti i te rere me te whakatairanga i te whakaurunga. Ko te whariki mana o te horo te kaupapa e rua hei whakamarumaru i te oneone mata mai i te horoi me te whakangawari i te hanga tarutaru tere.