The third piece of 1/4″ quarter round was then glued to the 2nd piece and the drywall ceiling. The small pieces of toothpick were used, as well. to keep everything lined up properly. Once all of the glue had dried, the ends of the toothpicks were cut off and sanded smooth. After that, some wood filler was applied to fill in any remaining crack, holes, or pits.
After drying, the wood filler was then sanded smooth.