How to Fix Peeling Paint on a Window Sill


Painted windowsills, both inside the home and out, begin to crack and peel after years of wear and tear and exposure to moisture. This small problem gives a home an old and unkempt appearance. A little scraping, sanding and painting, and the windowsills will look like new again.

How to Fix Peeling Paint on a Window Sill
(Thomas Hooke/Demand Media)

Things You'll Need

  • Safety glasses
  • Putty knife or paint scraper
  • 100-grit sanding sponge
  • 220-grit sanding sponge
  • Plastic drop cloth
  • Paint brush
  • Latex primer
  • Semi-gloss interior or exterior paint
Step 1

Use a putty knife or a paint scraper to remove the peeling and cracked paint. Sand the surface with a 100-grit sanding sponge. Switch to a 220-grit sanding sponge to finish off with a very smooth surface.

Thomas Hooke/Demand Media
Step 2

Cover any areas you do not want to get paint splatters on with a plastic drop cloth. Apply a layer of latex primer paint with a paintbrush. Allow 2 or 3 hours for the primer coat to dry.

Thomas Hooke/Demand Media
Step 3

Apply two coats of semi-gloss interior paint if you are painting an inside windowsill. Use a semi-gloss exterior paint for an outside windowsill. Allow a few days for the paint to dry and cure.

Thomas Hooke/Demand Media

Tips & Warnings

  • Choose a time of the year that is warm, dry and has less humidity.
  • Wear safety glasses to avoid getting paint chips in your eyes.


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