Ikhwalithi ephezulu yomndeni ehlotshiswe ngethusi lesilwane noma isithombe sodonga lwebhubesi le-resin
Sesineminyaka engu-43 sisebenza embonini yezithombe, siyakwamukela ukwenza ngokwezifiso izithombe eziqoshiwe zemabula, izithombe zethusi, izithombe zensimbi engagqwali kanye nemifanekiso ye-fiberglass.