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Electric sanding throws a lot of dust and debris into the air. Protect your face with goggles and a dust mask or respirator. Wear heavy work gloves to avoid getting cut. Also cover all your exposed skin with your clothes so no debris gets stuck in your skin. Work in a well-ventilated area. Outside is best. If you're in a garage, keep the door open. Spread a sheet under the car to catch any falling debris. A dual-action sander uses compressed air to spin the sanding surface. Start with a coarse, 40-grit sandpaper. This strips off the top layer of paint. You can buy or rent sanders from a hardware store. You can also use a grinder. This strips the paint off much faster. However, it can also damage the metal. Always keep the grinder moving and don't hover over one spot to avoid denting the bare metal. Another option is sanding by hand, without an electric sander. This is extremely time-consuming, but you will save money. Also, sanding by hand is a better option if you own a classic car to avoid damaging the body. Use a sanding block at the same grit levels as you use for the electric sander. Flat surfaces like the hood or roof are the easiest to sand, so start here. Start the sander and press it down on the car surface with even pressure. Leaning the sander to one side could cause denting. Slide the sander slowly across the car and let it grind off the paint as you move. If the car has only been painted once, you'll see the white primer and then bare metal. If there are multiple paint layers, spend more time on each section to strip it away. Some spots may be tougher than others. If the paint won't come off in one spot, keep the sander there for a few seconds to work the paint off. Replace the sandpaper when it gets too dull. You'll notice that it doesn't strip the paint as well after a while. This means it's time for a new piece of paper. Once you've tackled the larger areas, move on to tight areas like the ones around the doors. These are tougher to reach, so try opening doors and the trunk to get into tight spots. Angle your sander so it fits into these areas. Spread a sheet inside your car to protect the interior from dust and debris. If there are tight areas at angles you can't reach, try using a sand block on these spots instead. After finishing with the 40-grit paper, wipe the car down with a moist rag to remove any dust. Then load finer-grit paper onto the sander. Do another sanding round with 120, 220, and 400-grit paper. Remember to wipe the car down in-between each sanding session. This process removes small sections of oxidation and rust that you can't see with the naked eye. Leaving these on the car's surface could damage a new paint layer over time. when you're done sanding to remove remaining dust. Once you've gone through all the sanding steps and the car is down to its bare metal, give the car a good wash. Use water and soap to remove any dirt and debris. Then let the car dry completely. For a faster job, you can also wipe the car down with mineral spirits rather than wash it with soap and water. Once all the paint is off and the car is clean, continue with painting the car. If you're going to paint the car, apply primer as soon as the car is dry to prevent rusting.
Put on goggles, a dust mask, heavy gloves, long sleeves and pants. Load a dual-action sander with 40-grit sandpaper. Begin sanding on large, flat surfaces like the hood. Open the doors, hood, and trunk to access tighter areas. Sand again with 120, 220, and 400-grit paper. Wash your car