environmental hygiene. Mechanical polishing: large-scale construction, in order to improve work efficiency, can be mechanical polishing methods, such as electric sander (disc, vibration).
        Sanding methods of dry grinding, wet grinding machine  grinding wheel three.
1 Dry sanding: Using sandpaper to polish. For species of hard and brittle paint polish, the drawback procedure will produce a lot of dust, environmental hygiene.
(2) mechanical polishing: large-scale construction, in order to improve work efficiency, can be mechanical polishing methods, such as electric sander (disc, vibration).
        3 Wet sanding: sandpaper dipped in water or soapy water and polish. Mill can reduce the wear scar, improve the coating smoothness, and Province sandpaper, and effort. But should pay attention to the water mill underlying paint spray when a layer is completely dry mill to wait before Tu underlying paint, or the paint is easy to whiten. Another highly absorbent substrates should not Watermill.
        Grinding process has three main roles:
        1, enhanced coating adhesion. Generally required before the new paint sprayed on after hard work sanding old paint layers, paint over smooth surfaces due to poor adhesion, polished coating can enhance mechanical adhesion.
        2, the substrate on the substrate surface burr removal, oil dust, etc.;
        3, for the putty scraped surface, generally the surface is rough, you need to get through the sand over a flat surface, so sanding the surface roughness can be reduced role.