We just repainted the bottom of our six man and used Interlux Toplaq. It's about $40-50 a quart which should be enough to do one coat on a six man. It's pretty easy to work with, meaning you can use a roller or brush to apply it and it will look pretty good. I also needed a small amount of black paint for our ama so I used the Interlux Brightside for this. It's pretty similar to the Toplaq and looks pretty good.
Talk to the folks at your local marina as they are going to paint more fiberglass than anyone else and will have their own recommendations. It's not hard, just plan on spending a lot of time on prep work (sanding, sanding, and more sanding) or your painting is going to look like crap. The local marina manager recommended Toplaq to me and using a random orbital sander with 280-320 grit sandpaper to do the prep work. I think we've spent about $250 on paint and supplies (but we also had to buy a sander which was about $90) and at this point probably 25-30 man hours on it.

What doesa "Salt Lake City painter" have to do with 6man hull painting? This might be the new Mormon tactic to convert us all.

We spent a lot of time sanding with random orbit sanders, filled in the gouges and scrapes and sanded again before painting. One coat rolled on with someone coming behind to brush it out a little and it came out like that. We did the same thing on the ama. Nothing done after painting though to make it glossy.
It doesn't look new, but it looks about ten times better than it did.

What's the phrase? Better living through chemistry. ;-)

2 coats of Dura guard paint is tuff and looks good.