Re: Prep work before painting
Carefully sc**** the paint ridges as flat as possible, then install your same width or wider trim. When you caulk the new trim, it will hide the remnant of the old paint line. If the new trim is narrower, then you'll want to scrap it as flat as possible, then float with drywall topping compound, lightly sand to blend everything together nicely.
Large peeled patches, remove what is loose, then float the area with topping compound and sand smooth. Multiple thin layers work better than single thick layers. Don't be too aggressive with your sanding, just enough to blend the patch into the wall.
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