homerepair.gregvan.com Learn how to sand your drywall finish to smooth the wall and remove plastering defects. In this video Greg Vanden berge gives you a good idea how to sand the drywall plaster using a pole sander with 80 grit sandpaper. The real key to sanding your interior drywall finishes is to make sure that you apply the joint compound or plaster as smooth as possible, to eliminate using the pole sander at all. We hope you enjoy watching our home repair and remodeling videos and would appreciate any positive comments about them.