![]() To finish, a normal-sized sanding block can then be used to touch up the edges of areas where you applied the auto body filler. ![]() In addition, by using a long sanding board or air file will also give you a better indication of the high and low spots than a smaller sanding block would.Īs we visualized earlier, the longer sanding board would span the high spots and bring them down to the same level as the low spots, where the smaller sanding block would simply ride over the wavy panel.Īlthough sanding blocks are available commercially in various shapes and sizes, you will often need to improvise to access the particular area that you are sanding. from front to back with the long sanding board or air file held vertically against the panel, you would tend to flatten the curve, this isn’t the desired result you want to achieve.įurther benefits of using a long sanding board: ![]() It’s important to remember here that when auto sanding a panel that curves in one direction from top to bottom say but is straight from front to back, auto sanding is mostly performed by moving from top to bottom, up and down the panel obviously with the long sanding board or air file held horizontally against the panel.īy using a long board across the crown i.e. The secret to achieving the straightest and flattest possible surface upon which to apply paint is to use a long sanding board or block with progressively finer sandpaper.Īfter you rough sand using relatively coarse 80- or 100-grit sandpaper by hand, then use an air file sanding machine with 200- to 320-grit sandpaper. This will bridge the high and low spots of the panel, smoothing out the wavy panel texture. Therefore, instead of using a short sanding block, use a long sanding board. The panel will indeed become smoother but it will still be wavy. Using a small sanding block on a wavy panel will simply make the block ride over these waves. ![]() Move them up and down and crossways diagonally too, rotating the board or block as necessary for ease of operation.īy maneuvering the auto sanding board or block in different directions will guarantee that all areas are sanded smooth without grooves, valleys or perceivable patterns. Do not simply maneuver them in a back and forth direction from the front to the back. The correct method of operating auto sanding boards and blocks is in all directions. How to operate auto sanding boards and blocks: Using your hand alone will tend to make the panel wavy as more pressure will be applied by your fingers and less in the areas in between them. You hand isn’t flat and because of the irregular pressure your hand will therefore generate you should not sand without using some kind of auto sanding block. Have you ever been inside an amusement park fun house? You remember the fun mirrors they have on the walls that are purposely made wavy? Think of wavy body panels as those fun house mirrors, if you don’t make them as flat as possible you could be seeing a distorted version of you standing there as you admire your work. Trust me, it will be more than worth your effort once you have applied the base coat and clear coat, the panel surfaces will look like mirrors! Take out that sandpaper again, a sanding block and carry on auto sanding until all those imperfections are taken care of. If you answered ‘yes’ to any of these questions, it means that you have some more work ahead of you before you can start reaching for that paint spray gun. Feeling the panel with your hand periodically while auto sanding will give you a good indication of any high and low spots. You will be surprised what your fingertips can pick up what your eyes miss. Is the overall texture of your vehicle still a little rough? Try running your fingertips over all of the panels on your vehicle. Since you now have the panels free of any surface damage and aligned properly, you’re still not ready to begin reaching for your paint spray gun.Ĭan you find any other minor dents or surface damage present on any of the panels?ĭo all of the panels such as the doors have a series of vertical lines in them? (This is especially important if and when another door came into contact with your door panel). Long Sanding Board and How to Correctly Sand Auto Body Filler so that all Body Panels are left Perfectly Smooth and Flawless. Discover the Methods of Auto Sanding such as Using an Auto Sanding Block vs.
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