weird.. idk.. still looks like because of the solid black areas that someone attempted to rust proof and ran a few can's short of spray.. wouldn't an oil, from starting without the cap, speckle? I've seen what it can do to the underside of a hood.. ("friend" drove my car from Florida to NH and round about NY forgot to put the cover back on when she topped off the oil.. another 500 miles and a loud rappppp rapppp rappping.. from the bone dry engine.. the engine compartment was spashed with oil, and the under side of the hood.. but the bottom of the car never saw a drop.. centrifugal force? speed? I did the undercarriage on my vx with the rust stop/rust proof black spray, and it looks exactly like those pic's.. with the exception that I used 6 cans.. to get a full even coat.