150 grit sandpaper is a medium-coarse sandpaper that falls into the category of 'very fine' sandpaper. It's commonly used for moderate sanding and blending of compounds, preparing surfaces for painting or staining, and for sanding bare wood. The Gator brand offers a variety of 150 grit sandpaper products, including sheets, sponges, and more, suitable for different applications such as drywall, plaster, varnish, fiberglass, paint, and metal.