Nqe lus piav qhia:

Cov txheej nplaum zoo rau cov ntaub pua tsev ruaj khov txuas kom haum txawm tias cov ntaub pua plag nyuaj tshaj plaws. Fiberglass ntxiv rau ntxiv dag zog thiab yoog raws thiab txhawb nqa nrog silicone kho crepe ntawv.