Sanding Plaster Walls Grit. Round orbital sanders are very good on plaster walls, but on woodwork you have to be careful because they can leave marks on your wood. Start off sanding with a coarse grit sanding block to take off the elevated surface and any bumps. Determining what grit for what job is also dependent on the job itself.
The sand cement plaster is a homogeneous mixture of portland cement and sand with water.
If you have textured walls, specifically venetian plaster textured walls, and you're looking to smooth start sanding your walls. If so, what is the best tool to use? If the lath behind the old plaster is sound, patching is a matter of troweling on layers of mud. You can then take a medium and light grit sanding block and sand down the new plaster until it is flush and smooth with the existing wall. I'm currently uisng a 60 grit to. As the grit becomes clogged with dust and paint, it becomes less effective. After the second coat of joint compound has dried, blend to the old plaster using 220 grit sandpaper. Plastering is done on the walls to remove surface imperfections, maintain line level and alignment.
