Use a sanding block and don't press real hard. If you press too hard there is a tendency to sand the area around the sag at the same time which can cause you to sand through the clear around the sag before getting the sag sanded out. We used a trick with a razor blade to scrape most of the sag off before sanding. If you try this GO EASY on the blade. You can easily leave nicks in the paint outside of the sag that may not sand out. If you try using a blade hold it perpendicular to the painted surface, 90° to the sag and hold it firmly. Scrape lengthwise along the sag & try not to contact the paint around the sag. Don't try to scrape it all. The closer you get to the painted surface the more chance you run of nicking the paint around the sag. When you get it close finish it off with a sanding block.
Save a life, adopt a senior shelter pet. The three main causes of blindness: Cataracts, Politics, Religion. Name your dog Naked so you can walk Naked in the park.
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