Hammer in any protruding nails and seal them with joint compound. Then sand the ceiling just after it dries out. Be careful never to sand the ceiling also about - you don't want to wreck it right after removing the popcorn ceiling. Edit: thanks in your solutions! Would you estimate http://popcornremovalcompanies78765.articlesblogger.com/19479845/the-ultimate-guide-to-how-to-remove-popcorn-texture-from-walls