I've got enough 2-pack polyurethane to spray the boat, I previously brush painted it, it stank to high heaven and the fumes got into clothes/skin/lungs and remained on my breath for days. Clearly the stuff is lethal. I want to spray the boat this time but I'm pretty sure this stuff is a big no-no for COSHH reasons let alone pollution of the surrounding environment. There is some Sigma Vikote 56 modified acrylic (whatever that is) on E-bay at a very reasonable price. It appears to be developed for the big ship industry. Does anyone know anything about this type of paint, what thinners to use, eg water, Xylene, acetone, white spirit, and is it at all successful as a top coat on a cruiser.