I used Signature to repaint the bottom of my boat with excellent results. Here's the
post I made on that job last spring. I left a sample of it in salt water for over a month with zero problems. Tom Fabula said he painted his swimming pool with it over 10 years ago and it still looks great! No other urethane paint will hold up under water like that!
Boat was subsequently left in water for a couple of weeks. Had a little bit of growth on transom and bracket flotation tub where moving water didn't knock it off, but that paint is so slick that it wiped right off with a wet rag!
Here's a link to my
photobucket album in case the links don't work in the old post.