I just recently got an intensity sails mkII to use as practice sail, but as luck would have it I ripped my race sail so I have a conundrum. I could stick numbers on it and use it in regattas but I'm wondering if i could get away with it?
Depends on who is looking closely at your sails during the race. Without the button and logo, it is quite obvious. I personally would not attempt to race in a regatta with an illegal sail. Maybe a beer can race or local series would be fine for me, and if I won a race, I would not accept the trophy and admit I didn't have the correct sail.