Inkcazo emfutshane:

Umgangatho ophezulu wokubambelela kumgangatho wokudibanisa ikhaphethi ukulungiselela nokufakwa kolona khaphethi lunzima. I-fiberglass yomelezelwe ukongezwa kwamandla kunye nobhetyebhetye kwaye ixhaswe ngephepha eliphathwayo le-silicone.