Boat Bottom Blisters look exactly like a blister or pimple on the bottom or side of a boat. It usually occurs when water gets absorbed through the paint or water passes through the gel coat of the boat bottom surface. And even creates air pockets in the paint through the water evaporation. Usually, most of the boats, whether it is a sailboat or a powerboat will get affected by the blisters with some too many around the rim of the water level ranging from small size to softball size. For more details, visit www.barnaclebusters.com/services/boat-bottom-cleaning/