Ọ gwụla ma akọwapụtara ya ọzọ, a ga-echekwa ngwaahịa resin Polyester Unsaturated n'ebe akọrọ, dị jụụ na ebe mgbochi mmiri. Ejiri kacha mma n'ime ọnwa 12 mgbe ụbọchị mmepụta gasịrị. Resin Polyester Unsaturated kwesịrị ịdị na nkwakọ ngwaahịa mbụ ha ruo obere oge tupu ejiri ya. Ngwaahịa resin Polyester Unsaturated dabara adaba maka nnyefe site n'ụzọ ụgbọ mmiri, ụgbọ oloko, ma ọ bụ gwongworo.