Many people dislike concrete’s typical drab gray color. So they ask me about painting garage floors, steps, patios and even sidewalks. Paint, in my opinion, is not the best way to achieve the goal.

Then you can paint with a product designed for exterior concrete, such as Behr Premium Plus Porch & Patio Floor Paint. All of the above is fairly standard advice, so your painters may have done that.

All those colored lines you see spray painted on the ground, streets and sidewalks typically mean one thing: someone’s going to start digging. Each color tips off a worker to what’s ...