不合你们两位打嘴仗了,贴一份专业指南,看完以后刷墙照着做(sanding 部分)
Always sand and paint the ceiling completely (following these same steps) before addressing the walls.
Using a pole sander fitted with 120-grit paper, sand the walls (make sure to wear a dust mask). Sweep the sander side to side as you work your way from the top down. Apply medium pressure, and take care that the head doesn’t flop and gouge the wall. Change the paper whenever the grit gets clogged with dust.
Remove bumps or drips on painted molding with a scraper. Then, using a dampened coarse-grit sanding sponge, rough up the surface. Keep a bucket of warm water nearby, and continually rinse the sponge. Finish with a dampened fine-grit sponge.
Using a wet/dry vacuum, clear all the dust from the walls and trim. Wash the walls with a sponge, using warm water and dish soap. Scrub greasy or waxy spots. Wipe everything down one last time with clean water