The "Finesse It" works great on gel coat too. For a badly weathered boat, wet sand it and then try 3M Super Duty rubbing compound then use the finesse it after that. On a lifesize boat, the 3M super duty and a high speed buffer will really shine faded gel coat and clear gel coat on bass boats, if the gel coat is not "dead". A dead surface means that it is too oxidized for even sanding and polishing to bring it back.
Mark