Petroleum asphalt, mbishi zvinhu zvakafara, mitengo yakaderera. Zvisinei, mamiriro ekushanda asina kunaka, akaoma kuvimbisa kunaka, kusvibiswa kwakakomba kwezvakatipoteredza. Coal tar epoxy, iri nyore kushanda, asi yakareba yakavhara layer inorapwa nekukanganisa kwezvakatipoteredza, yakakodzera basa remumunda, inotevera 10 ℃ diffi...
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