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If you are looking to remove paint from a surface, the correct sandpaper is highly important is as not to score or ruin the material underneath. The grade of the sandpaper you use will be influenced by the amount of paint you are looking to remove and the type of surface underneath it. If you have detected the presence of a thin, clean layer of car paint, you may be best advised to just use a liquid paint remover for best results. However, sandpaper can be used on any other task. Course Sandpaper
Usually graded at about P40 to P80 grit grade and classed as being course, this type of sandpaper is used take off thick layers of paint and are ideal if used with a sander. Be cautious when using course grit sandpaper, however, because it can seriously damage the underlying surface and create large score marks in the softer materials such as wood. Medium Course Sandpaper
Medium course sandpaper is graded between P80 and P180 on the grit level and offers a good level of paint removal which is less likely to destroy the underlying painted surface. If your painted surface is an intricate design, you are better advised to use medium course grade to protect the carved design beneath the paint.
Medium Sandpaper
This has a higher grit grading of between P180 and P500 and will not be as effective at removing the majority of a painted surface. This grade will be more useful once you have eliminated most of the paint using a course or medium grade paper. Medium sandpaper will take the next level of paint and reduce it further by sanding the final layers away.