#180–#220 Grit: Fine
Sometimes, fine-grit sandpaper is used to roughen glossy paint in preparation for applying another coat. Bare wood that will be stained usually should not be sanded with higher than 220-grit paper. Fine or ultra-fine sandpaper grits are used for furniture work.
Regarding this, what does grit mean on sandpaper?
The grit size of sandpaper is usually stated as a number that is inversely related to the particle size. A small number such as 20 or 40 indicates a coarse grit, while a large number such as 1500 indicates a fine grit.