Imatsogolera yokhazikika yophatikizika yokhala ndi mafuta amkati ndi chakunja. Amagwiritsidwa ntchito popanga mapaipi a PVC. Zili
kukonza kwambiri magwiridwe antchito akale. Sizingaphule chowala, chowala komanso chowala, ngakhale makulidwe a chinthu chomwe chidzakwaniritsidwa chikusintha. Nthawi zambiri, musafunikire kuwonjezera mafuta ena.