If the door board is made of wood or paint sheet, periodic waxing is the most effective way to maintain bright-colored surface, while glass or resinboard needs no waxing.
如果门板采用木质或烤漆板材，定期打蜡是保持表面鲜艳亮丽的有效方法，而玻璃或树脂板材则不需要打蜡。
2
Effect of potassium permanganate etching solution on the roughening of epoxy resin laminates board and 3240 epoxy resinboard at various temperatures and times was investigated.