When it comes to sanding between coats of paint, the grit of sandpaper you should use depends on several factors, such as the type of paint you are using, what you are painting, and the surface you are painting on. Generally, 180-220 grit is a good choice for sanding between coats of paint, as these extra fine grits do a great job on most interior walls. However, for heavy sanding or stripping, you may need to use a coarse 60-grit sandpaper, while for smoothing the surface and removing minor imperfections, medium 120-grit sandpaper or higher is your best choice. Very fine grit sandpaper, such as 320 to 400 grit, is used for light sanding between coats of finish and to sand metal and other hard surfaces.

Its important to note that sanding between coats of paint serves multiple purposes, such as creating a slightly rough surface which helps your paint adhere better as well as removing any old paint. However, sanding is not always necessary for every painting project, and it depends on the type of paint you are using and the surface you are painting on. For example, if you are working with bathroom trim or kitchen cabinets with semi-gloss or high-gloss finishes, youll most definitely need to sand between coats, as most paint wont adhere to a glossy surface. On the other hand, if youve already painted your living room with a matte or eggshell finish paint, after adequate drying time, youre safe to apply a second coat with no sanding at all in between.