I have checked the forums to find out how to clean my oxidized mast and all the other black aluminum on my boat. i had seen where some said to use penetrol. i was buffing out my hulls with turtle wax low cut polishing compound (it worked really well by the way) and wondered if it would do anything to my mast..... i tried it with what was left on the buffer and i was amazed at the result! my mast, rudder castings, tiller arms etc. are like brand new! (my boat is 31 years old) does any one see any negatives to this? it was to dark to take pics but will try tomorrow in the daylight.