Sandpaper for your paint sander comes in a wide range of grades, or grits, for various tasks. Read below on how to determine the proper sandpaper grade for your paint sanding project.
Step 1: Investigate How Much Paint is On Surfaces
If you live in a 1950s or earlier dwelling, your walls could carry up to 10 layers of paint. Cut down through the paint to the wall surface at an inconspicuous location near a door jamb to find out how much paint you will have to remove.
Step 2: Remove Multiple Paint Layers
Affix a sheet of the coarsest sandpaper, 60 to 80 grit, to your paint sander to get through the layers.
Step 3: Remove Paint Lumps
Choose a medium sandpaper, 120-150 grit, once you are down to the drywall, plaster or wood wall surface to remove paint lumps and other surface irregularities.
Step 4: Fine Sanding to Smooth Off Surface
Attach a fine-grit sandpaper, 200 to 300 grit, to the paint sander to bring the wall surface to a smooth finish, ready for primer.
Step 5: Safety Tips
Always wear eye goggles and a filtering face mask when sanding. Old paints can contain lead, a source of lung problems even from limited exposure.