1. Cov kev qhia tshwj xeeb thiab kev kho kom qhuav (natural air drying lossis steam drying) yuav tsum tau qhib lub cav rau hauv lub rooj zaum strips hauv cov thoob khib nyiab sab nraum zoov
2. Tom qab ntawd ua cov txheej txheem tom qab los xyuas kom meej qhov flatness ntawm lub rooj zaum tuav ua ntej pleev xim.
3. Cov ntoo yuav tsum tau pleev xim nrog primer rau ob peb zaug thiab tom qab ntawd polished kom tshem tawm cov burrs ntawm cov ntoo saum npoo, thiab tom qab ntawd pleev xim rau.
