I took the wheels/tires off my car to comply with a service bulletin dealing with brake caliper bolt torques and in the process noticed this possible crack in one of my wheels. The wheels are painted with color then clear coated and I suspect this is just a crack in the paint/clearcoat. I visually checked the back of the wheel and found no crack going thru. Is there a test I can do to check to see if this is a crack in the metal or just the paint? I really don't want to have to sand off the paint to check. The wheels are aluminum.
Sorry these pictures are kind of big but is necessary to see the detail. The toothpick points to the crack.
This picture is just for orientation:
