Plastering Technical Guide — Preparation for Painting - USGSurface Cleaning The gypsum plaster surface must be clean, sound and dry. Do not sand or buff minor wall imperfections prior to painting, as this creates dust.sand walls before painting,Fine Homebuilding Magazine #245 Flawless Interior Paintingyou're painting interior trim and you don't do a good job of sanding, . Sawdust, dirt, and other debris on the floors and walls need to . Before starting the.general tips for painting your interior - Paint AidsFor sanding. • The PAL® Sanding Sponge (coarse), or PAL cork Sanding . Previously painted walls & ceilings . Try to complete a whole wall before taking a.
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