Peeling Windowsills & Frames

Water sitting on windowsills will eventually penetrate a paint film through cracks and openings in the coating.


  • Remove all loose paint by scraping.
  • Feather all rough edges with sandpaper.
  • Remove old glazing and reglaze.
  • Caulk joints at a 45-degree angle.
  • Spot-prime with exterior primer.
  • Use oil-based gloss paints for surfaces exposed to standing rain and snow.
  • Leave a 1/16″ edge of paint on the pane of the window to prevent water from getting behind the paint film.
  • Use of storm windows helps prevent peeling from recurring.