Here's what I found out - (spelling optional here)

I'm forgetting the names of all those popular brands right now but
there are sterling, interlux and a buch like that and then there is
allgrip. Apparently, they are all sold as clear and in huge 55 gallon
drums or something near that size. The individual companies buy it as a
generic paint, add color, label and market it as their own. Some have
their own hardeners or thinners but they still come from the same plant
(I think it is DuPont but I am not sure). They are all interchangeable
except Allgrip that is its own thing.

The same paint is what is used for auto painting and in fact more of it
is used there then anywhere. Metro paint sells the generic of both
types of paint, sterling and allgrip. Allgrip costs about $16 more per
1.5 gal setup if I recall. The guy that works there talked me out of
allgrip though and I cant remember all the reasons but basically its
not as easy to work with.

I first used it their paint on my boat in 1994 and it stayed very nice
until about 2 years ago when the gel coat started showing through. The
paint itself it fine where I didn't scrub it but most of the boat has
been scrubbed had and often. I cruised for nearly 5 years out in the
Caribbean on my boat then stored it in Miami. It wasn't until it got
whacked by Charley that I started noticing a reason to paint again.
Then after I got whacked again in Miami last October by Wilma and lost
my mast I decided it was time to paint again, so I am going to do it
when I get there in a week or two,.

In the mean time, I worked on a bunch of boats and used the same paint
not less then 10 times and had great results with it. I never sprayed
the paint so it was never perfect but with white, on a topside, it
looks really nice. Beware that on the cabin sides it was good and you
can't notice the ripples unless you look really close but they are
there. I brushed it on BTW.

One boat I painted the hull on, I rolled with those little white
rollers from home depot and the job came out really nice but I put
several coats and then wet sanded between coats - something I did not
do on any of the decks (I like a little traction anyway)

By the time I get what I need to do a 30 foot boat deck I am just about
$100 and that includes everything including a paint suit. It's the
best price I have found so I stick with them.