inflatable

Dinghy - from dingi the Hindi word for "small boat" I know I'm going to need one sooner or later, but man, the options are vast and varied. Inflatable versus rigid hull? Or maybe a rigid hull with inflatable sides? Or maybe an inflatable with rigid floor boards that you can remove to collapse...

Thinking of painting the bottom of our inflatable this year. Have been storing it inflated on deck while in the slip to keep it free of grass growth but tired of hauling it up. What kind of paint will work well enough so that I can leave it in the water and survive a seasonal roll up as well?