Which grit to use for sanding?

When sanding surfaces, it's important to choose the right grit. For removing old paint or lacquer, you typically use a coarser grit, such as 80 or 120. For smoothing the surface and preparing it for painting, a grit of 220 to 400 is suitable. For finishing and polishing, you can use a very fine grit of 600 or higher. Always choose the grit that fits your specific project and the material you're working on.