 Show All primer and filler coats must be thoroughly hard dry before any sanding and final preparation is carried out. Final sanding before applying colour coats is generally carried out wet using the appropriate fine grades of WetorDry abrasive paper. Small areas can be sanded dry but a finer finish and extended abrasive life is achieved by wet sanding. Preparation for solid colours can be with 500 grit or finer WetorDry papers, but metallics and basecoats will need final flatting with no coarser than 800 grit, preferably finer. The use of coarser grades of WetorDry will result in visible sand scratches which will show through the final finish, even if extra coats are applied. Users of power tools, particularly D.A. sanders, can use 320 grit or finer for solid colours, but basecoat metallic finishes are best finished with finer grades of WetorDry paper. Large areas or vehicles which do not need to be 100% perfect can be sanded with orbital or d/a sanders using dry abrasives, but the final finish is usually lower quality than if hand flatted If the existing paint around door handles, wiper spindles etc. is in good condition and only needs to be sanded to `key' the new paint, abrasive nylon pads, commonly 3 M’s Scotchbrite, are available in suitable grades from motor factors. As they are soft and flexible access to difficult corners is made much easier.
Most automobile painters will agree that sanding is one of the most time consuming parts of the entire paint job. The more time you take in your sanding techniques, the better the end result of your paint job will be. I’m sure you have heard the expression; it’s all in the prep work. You can use sand paper from a DA ( sticky on one side) as a wet sand paper by sticking two of them together. I prefer to use this sand paper for my 6-inch DA. Some will tell you that this idea uses more sand paper. But actually it uses less. When you stick two of them together they become waterproof sand paper. After you have used the sand paper several times, you can simply dip it into a bucket of water and rinse it, and it becomes practically new again. Moving it in the water will let all the primer that you have scratched off drop into the bucket of water. By rinsing your sand paper you will save money and time. Also, when using a bucket of water, you will have saved several gallons of water. When sanding with 600 grit paper, do not push too hard; this will cause the paper to crinkle and absorb water. If you lightly scratch with the paper it will work more efficiently, and it will last ten times longer. By using this method, you can reduce the wet sand paper from 10 pieces to just these two. After you have sanded an area of one square foot (approximately), you will then wipe the area with a sponge. When wiping with a sponge, do not use a circular motion. Even wiping back and forth can leave particles behind. Start at one location and wipe in a straight line. Do this until you have stopped at a gap or edge of the metal surface you are wiping. At this point, rinse the sponge. While it is under the water move it back and forth so that any small and large particles remain in the water. After removing the sponge from the water in the bucket, squeeze the sponge as hard as you can to get all the water you can out of it. This allows you to have less water on the area you are cleaning and allows the sponge to absorb a larger area of wiping before it needs rinsed again. Looking at the area you have sanded, it is sometimes difficult to tell if you have hit it all. In this case wipe the area with your hand of fingers and if it is smooth you have sanded it. But if it feels like sandpaper then you have missed this area. This area will require sanding again. Once you have sanded the entire vehicle the last step before painting would be to wipe it down with a tack cloth as seen here. Then you are ready to paint. I personally prefer the 3m tack cloth. By wiping the vehicle down with this tack cloth it will remove any lint, grease, or foreign particles left behind. It is a very low-cost way
to ensure a perfect paint job. Allow that to dry, then wipe the area with a tack cloth. Now you are ready to paint your vehicle. How long should paint dry before wet sanding?Chances are good your paint needs to dry for 12 to 24 hours before sanding begins. Most of the painters we spoke with like to spray late in the day so they can leave the car in the booth overnight before rolling it out for a rubdown.
Is it better to wet sand primer?Whether you wet sand primer or not depends entirely on what type of primer you're sanding. For latex paint primer (water, oil or shellac-based,) you don't need to wet sand, since the layer of paint will cover that perfectly smooth surface anyway. Auto-body primer, on the other hand, should be wet sanded.
What happens if you don't sand after priming?Do I need to Sand Primer on Wood before my Topcoat. You do not necessarily have to sand wood that has had primer applied. The problem that occurs when you apply primer to wood is that the grain of the wood can rise due to paint interacting with the wood and swelling the fibers.
What grit Do you wet sand primer?600 to 800 Grit – This sandpaper grit range is perfect for sanding surface imperfections in the primer, prior to paint application. It is recommended to start at the low grit end and work your way up to 800 grit.
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How long for primer to dry before wet sanding?
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