Patching Rotted Window Sills

Once in position, clamp it or use a few well-placed finish nails hold it until the epoxy dries—usually 8 to 24 hours.

Fill Any Voids

Once the patch is installed, we mix up a batch of epoxy with structural filler to fill and overlap the seams of the patch and any nail holes created during the repair.

Sand Patch

We wait 24 hours before sanding the patch and applying a quality oil primer to the entire windowsill. The painter will follow us with additional primer and two-coats of paint.

Editor’s note: Rob Robillard is a professional remodeling contractor and blogger at