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.
Jake,
I've suggested to my wife that for Christmas she could get us name graphics for the side of our Nacra 5.5sl if we can do it for a reasonable price. A while back someone posted Boat U.S. graphics page but I'd rather not go that route. I'd rather do business with other cat sailors. How do you want to do this? Via pm? Greg