Choose fine sandpaper for the best results
But because modern lightweight joint compound is so soft, you don’t need heavy-grit paper to sand it. Coarse-grit paper or sanding screens will leave undesirable sanding marks. We recommend 120-grit or 150-grit paper for the best results.
Likewise, people ask, do painters clean walls before painting?
Yes! For exterior painting, we usually power-wash the surface, or sometimes hand-scrub, to make sure it is free of surface contaminants. … Washing a wall before painting it will make sure the paint can adhere properly. It will also remove dirt or other materials that may show through the paint.
Smoothing walls before painting is necessary for surfaces previously painted with a gloss or high-gloss paint. For previously painted water-based paint, sand with a fine-grit sandpaper. For oil-based paint, a medium-grit sandpaper (100- to 150-grit) should be used.