We discuss this about once a month. A search for oxidation removal will get you lots of results.
Here is a link to my method with some results pics. I've used it on multiple boats with the same results.
http://www.mastercraft.com/teamtalk/...light=compound
here is another
http://www.mastercraft.com/teamtalk/...light=compound
and here is my 1985 Restoration thread that also talks about gel refinishing with photos
http://www.mastercraft.com/teamtalk/...ht=restoration