Personally I won't even buy WD-40. It has been proven to me for years to be a "rust provider". Many years ago when I was taking machine shop courses, I rep from the L.S. Starret Co. showed us that putting WD-40 on precision measuring instruments will only bring on a case of light rust. I have proven that it does this on other types of metals. I lub my PB Blaster, as I work on older cars also. IF you have not done so, remove the hinges one-at-the-time and soak in kerosene, PB Blaster, or maybe even vinegar (have not tried that trick). Do one hinge at the time.