When it looks like what you've sanded will blend well with paint on top of it, it's on to the next step which is VERY important and that's priming the raw wood. Do not skip this step! Paint itself doesn't stick very well to raw wood (or any other raw material, such as masonry, metal, etc.) Primer does, and paint sticks to primer very well. Therefore it is an essential step. It's okay to have the primer overlap the old paint.
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