If you own an old car (or just a car, quite frankly), you may have experienced oil leaks while your car sits in your driveway or garage. Or perhaps your patio or stone pavers have unsightly oil stains ...

Q: The corner of one of the concrete steps leading to the front entrance of my building has broken off. It’s the top step of four. Is it possible to repair it without replacing the whole staircase? A: ...