It says it's a hull polish, so I see no reason it wouldn't be legal. I know the Mono boys spray McLube all over everything, sails, hulls, rudders, etc. all in the name of less drag. I haven't spent the time (and money) to rub McLube all over my sails yet but I do wash and wax (with Teflon polish) my hulls, boards and rudders before I go racing. I'm not sure it makes me any faster but I know it makes it really hard to climb on board after a crash! <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" /> <img src="http://www.catsailor.com/forums/images/graemlins/blush.gif" alt="" />