I notice on my 89 and 90 Corolla that the frame of the car around the radiator is black. (For example the strip above the radiator at the front of the engine compartment.) I had always wondered if the factory painted the whole unibody black and then painted all parts of the car except the front another color? Or did the factory paint the unibody the final color of the car and go back and paint the part around the radiator black? Well, I've taken the engine out of a '90 Prizm and am trying to clean out and paint the engine compartment. When apply my final cleaning step of spraying brake cleaner, the black paint on the front of the car somewhat dissolves. It reveals that underneath the frame is tan, like the rest of the car. The black paint looks somewhat tarry after the brake cleaner hits it. I wonder if it supposed to be a special sealing coat? Could I buy such a coating if I wanted to re-coat this area?