I worked on painting the interior trim in a home’s hallway. The trim had yellowed over time, so I first sanded it down with 220-grit sandpaper. After wiping off the dust, I applied Zinsser BIN primer to seal any imperfections and prevent future staining. I then applied two coats of Benjamin Moore ADVANCE in semi-gloss finish, using a fine-tipped Purdy brush for detailed, smooth coverage.