I leave the dinghy in virtually the entire summer (Maine) and at the end of the season have a hint of slime that washes off easily with a sponge. Very happy with it after two seasons. I apply it on both the fiberglass and inflatable part of my Zodiac RIB and it works equally well on both areas. Before discovering the paint I once got a puncture from a barnacle that had grown on the inflatable, am very glad to have found a solution. The paint is pricey, but I only use half a quart per season.

Edit: Just noticed Stephan's post, glad to know CSC works as that's what I use on the big boat. May stick to the Petit, though, since I've already started with it.