Several of us have used the System 3 WR-LPU poly paint. It is water based and doesn't have any noxious vapors. It dries fast and can be recoated several times in a day.
If the weather is too warm, it can dry too fast and leave marks at the overlap. I used a foam roller and then tipped it with a foam brush.
I painted my bottom Mercer Green and like the way it came out.
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Bob
Completed Malahini (launched 6/24/2012)
http://bobsboatbuild.blogspot.com/