Hi Henry- That's interesting. Last November I spec'd Ultra but found it didn't like being applied over Interlux Micron Extra. When I called to see what the problem was, Interlux told me they had discontinued making Ultra. Regards, John "Seahorse" > We use Interlux Ultra - a mere $209/gal fr Boaters World **************Planning your summer road trip? Check out AOL Travel Guides. (http://travel.aol.com/travel-guide/united-states?ncid=aoltrv00030000000016)