Can You sand down a car before painting?
Download Article Sand down to the bare metal of the car. Most experts recommend sanding until you’ve removed both the paint and the primer from the car. This can take a long time, but the new coat of paint will go on much smoother if you do. 
How long does it take to sand a car?
Work one panel at a time for an even sanding. You can separate the car into different panels: the doors, the roof, the hood, the trunk, the bumper, and the fender. In total, each panel will probably take about 2 hours to sand down completely.  It might sound like a long time, but it’s totally worth it for a new, smooth paint job.
Can you paint over existing car paint?
You can go ahead and use a primer coat to cover your existing paint before adding your new color. The new paint will go on shiny and smooth, and you don’t have to worry about sanding anything down.  This includes paint in the doorway and crevices of the car. No, if the existing paint is cracked.
How to remove scratches from a car before painting?
This sandpaper is a little smoother, and it will help remove some of the scratches that the previous sandpaper left behind. Your car won’t look perfect at this point, but that’s all right.  Finish with 1200- to 2000-grit wet-to-dry sandpaper. This will give your car the silky smooth finish that it needs for your new coat of paint.
How to make hand sanding easier?
To make hand sanding easier, staple a piece of sandpaper to a block of wood so it’s easier to hold onto.
How to sand a car panel?
Move your power sander in small, circular motions . Attach your sandpaper to the power sander and turn it on. Press it up against your car as hard as you can, and move it in small circles across the entire panel.
What is the best tool to sand a car?
Use a power sander for the majority of your car. A power sander will be way easier to use than hand sanding your entire car. Use this tool on the large, flat surfaces of your vehicle, like the doors, roof, trunk, and hood.
How to clean sand off car before painting?
Wipe your car off with a damp cloth before priming and painting. Sanding generates a lot of dust, which can get stuck in automotive paint and primer. Before you move on, use a damp cloth to wipe down the outside of your car. If you’re super worried about dust, use paint thinners to wipe down the outside of your car.
What to wear when sanding?
Wear a mask, gloves, and goggles for safety. Sanding creates a lot of fine dust particles that can irritate your lungs, eyes, and skin. Before you start sanding, put on your protective equipment and keep it on until you’re finished.
How to get a rough finish off a paint job?
Start with a 180-grit sandpaper. This will roughly take off the outermost layer of paint and primer. You might notice that it looks a little scratched and rough at this point, but that’s okay.
How long does it take to sand down a car?
In total, each panel will probably take about 2 hours to sand down completely.