1. Cov xim tuav tau zoo, cov kuab tshuaj nyob rau hauv cov kua roj vanish tsis tuaj yeem ua rau tus number case los ntshav los yog ploj, thiab nws yuav tsum muaj hardness txaus thiab ruaj khov los tiv thaiv kev ua deformation ntawm cov txheej txheem tom ntej;
2. Txhawm rau txhim kho kev tsim khoom thiab txuag hluav taws xob, feem ntau cov txheej txheem luam ntawv kawg yog ua ke nrog cov txheej txheem kua roj vanish;
3. Cov kua roj vanish rau kas fes tin poom muaj cov khoom sib txawv, kev ua yeeb yam sib txawv, thiab kev siv sib txawv. Feem ntau, ntau hom varnishes yuav tsum raug xaiv raws li cov xwm txheej tshwj xeeb;
4. Kev kho cov kua roj vanish tuaj yeem ua rau saum npoo ntawm cov kua mis hmoov cov kaus poom npub, nrog cov ntawv zoo nkauj thiab cov nyhuv zoo nkauj zoo nkauj. Saib los ntawm cov ces kaum sib txawv, nws muaj txiaj ntsig zoo nkauj heev.