dry grinding
Dry grinding with sandpaper, suitable for grinding hard and brittle paint. Its disadvantage is that a large amount of dust will be produced during operation, which will affect environmental sanitation.
wet grinding
Wet grinding is done with water sandpaper dipped in water or soapy water. Water milling can reduce wear marks, improve the smoothness of coatings, and save sandpaper and labor. But pay attention to water milling before spraying the lower paint. First, wait until the water mill layer is completely dry before brushing the lower layer of paint, otherwise the paint layer is easy to whiten. In addition, the substrate with strong water absorption is not suitable for water milling.
Mechanical grinding
Mechanical grinding is suitable for large-scale construction. In order to improve work efficiency, mechanical grinding methods can be used, such as electric grinding machines (disc and vibration).