Suitable for wet or dry sanding and for sanding any surface.
Remember the smaller the number (grit) the rougher/course the paper is.
As a general rule of thumb use
80grit - Prep
120grit - Prep
240grit - Prep & sanding between coats of paint
400grit - Finishing
600grit - Finishing
1000grit - Finishing & wet sanding
1200grit - Finishing & wet sanding