The graphics are just as easily removed from sails as hulls - however, you'll find that the different sail materials might present different challenges in adhering vinyl. Secondly, people tend to get a little more sensitive about sticking things to their sails. The quality of the vinyl plays a big part in how cleanly the vinyl removes...time that the graphic remains on the hull plays largely in the equation as well. I also have a vinyl graphics business and Bonnie and I have been designing, making, and applying hull and sail graphics for several years.