A wax model free of defects is covered with a coat of zirconium silica hydrogel, after which Liu Guoxian makes a sand casting mold by covering the model with a layer of coarse casting sand. This completes the preparations for the dewaxing.
唯有完好無缺的蠟型才能裹上鋯粉與矽膠水調成的漿液，之後，二哥劉國賢再為它們覆上一層粗粒的馬來砂（耐火泥）而成為鑄銅的泥模，至此方完成脫蠟前的準備。