How to scrape and sand peeling paint on old exterior wood trim

Indiana homes have incredible historic character, but our extreme local climate takes a heavy toll on exterior wood trim. Between our muggy, humid summers and freezing winter temperature swings, exterior wood constantly expands and contracts. This moisture cycle eventually causes paint to crack, bubble, and peel.

If you are a homeowner in Center Grove, Indiana, or the surrounding Central Indiana area looking to restore your home’s curb appeal, tackling that peeling trim is the first step. Here is how to scrape and sand it like a pro.

1. Test for Lead and Prep the Area

Before you pick up a tool, remember that homes built before 1978 may contain lead paint. Always use a lead test kit first. Once you confirm it is safe to proceed, lay down heavy-duty drop cloths to catch falling paint chips. This keeps your lawn clean and prevents debris from scattering into your flowerbeds.

2. Use the Right Scraping Tool and Angle

Don’t just grab a flat putty knife. For detailed, historic wood trim, use a pull-scraper with a replaceable carbide blade or a specialized contour scraper. Pull the scraper firmly along the wood grain, keeping the blade flat to avoid gouging the soft, aged wood. Apply steady, moderate pressure to pop off all loose, flaking paint.

3. Feather the Edges with Sanding

Once the loose paint is gone, you will be left with distinct "valleys" where the bare wood meets the remaining intact paint. Use 80-grit sandpaper to smooth out these sharp ridges—a process called "feathering." Finish with 120-grit sandpaper for a seamless, smooth transition that won't show through your fresh topcoat.

4. Prime Immediately Against Indiana Moisture

Indiana’s high humidity will quickly penetrate exposed, raw wood. Do not leave scraped wood bare for more than a day or two. Apply a high-quality exterior oil-based or premium acrylic primer to seal the wood fibers and create a strong bond for your new paint.

Let the Professionals Handle It

Prep work is the most critical—and exhausting—part of any exterior painting project. Doing it wrong means your new paint job won't last through the next Hoosier winter.

If you would rather spend your weekends relaxing instead of climbing ladders, our professional painting crew is here to help. We proudly serve homeowners in Center Grove, as well as Hendricks, Morgan, Marion, and Johnson counties. Contact us today for a free, professional exterior painting estimate!