A.Bill Palmer, former editor of Concrete Construction magazine and president of Complete Construction Consultants in Lyons, Colo., responds: Motor oil doesn't really damage concrete. But if the surface is unprotected, oil can soak easily into the concrete's pores, where it's difficult to remove.

Paint won't protect concrete from oil, but other products will. According to Denise Breard, a technical representative for sealer manufacturer Vexcon Chemicals, water-based combination stain

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