Yes you can! As long as your existing finish is holding on good and not full of texture, you can Just Clean & Paint! If your existing finish is peeling, chipping or loose, you'll want to sand down those areas until all loose/peeling paint is removed and smooth. If your existing paint finish is full of texture or brush marks, ALL-IN-ONE Paint will settle into that texture. If you would prefer a smooth finish, you'll want to sand that texture down smooth. You do not need to sand to bare wood.