New, smooth concrete is too slick. You need to etch it. Use a liquid concrete etcher (muriatic acid alternative) or simply use a bonding primer made for masonry. This creates "teeth" for the paint to grab onto.
Here’s the good news: painting your concrete window sills is one of the cheapest, fastest, and most satisfying DIY projects you can do. It’s the “lipstick” of exterior home maintenance. But—and this is a big but—concrete is a diva. If you slap any old paint on there, it will fail faster than a New Year’s resolution. painting concrete window sills
And how to do it so the paint actually sticks (for more than a week). New, smooth concrete is too slick
Let’s be honest. When was the last time you actually looked at your window sills? This creates "teeth" for the paint to grab onto
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. Aesthetic Tip: Go Dark 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. The Verdict Painting concrete window sills is a weekend afternoon project that delivers a “new house” feeling. Just remember: clean it, etch it, and use the right paint. Do that, and your sills will outlast your mortgage.
