Rich~
Will you be using any grass or brush on your boat?
I have always put thatch on any boat that I wanted to hide in or near a marsh. I trust painted camouflage for open water (layout boat) hunting - but only if it's boldly contrasting and serves to break up (visually) the apparent shape of the boat. This boat was made for open water - but it would also gun next to salt marsh well IF you threw some wrack (dead plant matter from the high tide line) over it once you were in place.
I have seen lots of different base colors on Long Island grassboats. Some try to match the color of the dark (almost black) mud beneath the Cordgrass where they hide. The thatch (Salt Hay or Cordgrass) contrasts starkly with it. Others try to match the hues and tones of the thatch itself. Almost every grassboat at the SSWA Duckboat Show this past weekend had a "dead grass" coat of paint beneath their Salt Hay thatch.
I have used many different brands and many different colors over the years, but lean toward the olive/dead grass family of colors. I have used Parkers Marsh Grass for many years and am trying Lou Tisch's FME # 28 - Dead Grass Green - for the first time on Bill Abbate's South Bay. I am sure it will hide and hunt very well once it's grassed.
I would hesitate to rely on a camouflage paint scheme on a duckboat if it had lots of fine detail but was generally uniform in appearance overall. The effects of light are so strong that even boldly patterned camo on a flat surface disappears from many angles. Nothing compares with the 3D hiding ability of thatch or brush.
Hope this helps,
SJS