![]() Go over the surface again with 80 grit sandpaper to bring the rest of the surface down to the low spot. Instead, circle this low spot with a pencil, then draw more squiggle lines over the entire board. Don't try to remove the pencil marks from the low sections by sanding more! This will just make the low spots even lower than the rest of the board. You'll start to see the pencil marks disappear in the higher spots, while they remain in the low sections. Just let the spinning disc do all the work! Don't put a lot of pressure down on the sander. Sand with the wood grain at a speed of about an inch per second. Now start sanding with a coarse sandpaper grit (80 is a good place to start) in a slow, methodical manner. You don't need to go crazy, but it should mark every section evenly. Start by drawing a light, squiggly line across the entire surface of the wood with a pencil. You may think you're going to spend hours working your way up the grit numbers, but it gets progressively faster with every switch! Getting to know what grit to use and how long to use it is all part of the art of sanding. As you work your way up, the scratches become finer and less noticeable until you're left with a perfectly smooth surface! When to Switch Grits ![]() Likewise, the higher the grit, the smoother the sandpaper and the less visible the grit will be.Ĭoarse sandpaper will leave scratches in the surface that will be polished away by higher grits. There are less pieces of grit per inch, so the pieces have to be larger to cover the same area. ![]() This will also require the wet sanding technique to prevent clogging the sandpaper.Video can't be loaded because JavaScript is disabled: How Sandpaper is Made () What Do the Sandpaper Numbers Mean?īasically, the lower the grit number, the rougher the sandpaper. Be sure to use the wet sanding technique for the best results.ġ500 to 2000 Grit – When you need to smooth out surface imperfections and scratches before and after applying the clear coat, this is the grit range to use. It is recommended to start at the low grit end and work your way up to 800 grit.ġ000 to 1200 Grit – When you need to remove base coat imperfections, this grit range will do the job. It is recommended to use a sanding block too.Ħ00 to 800 Grit – This sandpaper grit range is perfect for sanding surface imperfections in the primer, prior to paint application. It can be used for pre-primer sanding, rough primer sanding, fine sanding spot putty, and final body filler sanding. Instead, it is recommended for any rough sanding that needs to be done prior to bodywork, as well as, shaping body filler.ġ20 to 180 Grit – Use this grit range for flattening out scratches, feathering edges of body filler, spot putty sanding, and light rust removal.ģ20 to 400 Grit – This grit range is much finer than the previous ones mentioned. The higher the number, the more abrasives present, making sandpaper finer.Ĥ0 to 80 Grit – This sandpaper grit is very coarse and will leave behind visible marks, so it is not recommended for small clear coat scratches and other similar applications. The lower the number, the fewer abrasives present, making it courser sandpaper. Sandpaper grit refers to the number of abrasive particles per square inch of a sheet of sandpaper. SANDPAPER GRIT SIZES FOR AUTOMOTIVE APPLICATIONS If you don’t want to damage the paint and surface on your car, make sure you keep in mind to choose the right proper grit sizes of sandpapers for your sanding work. Different sanding jobs request different grit-sized sanding paper to fulfill the car sanding tasks. When it comes to sanding vehicles, most people will have difficulty deciding how to buy, select or use the correct sandpaper grit size for their work.
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