Painting Concrete Window Sills [patched] 🔔

Apply one thin coat of masonry primer. Then two thin topcoats. Do not glob it on. Concrete hates thick paint. Wait 4 hours between coats.

Two-part exterior masonry filler (e.g., Rockhard filler ) for deep cracks. painting concrete window sills

Tape the glass and the wall siding. But leave a 1/16th inch gap between the tape and the concrete—this prevents paint from seeping under and creating a glue seal that peels later. Apply one thin coat of masonry primer

Everyone buys white paint for sills. But consider a dark gray or charcoal. Why? White shows every speck of dirt, pollen, and bird dropping. A dark sill hides the grime and makes your window glass look like a bright, floating mirror. painting concrete window sills