I am looking for a good way to put markers on my Laser mainsheet. I have two markers on my main sheet: One at 90 degree boom angle and the other one for a little narrower angle. I tried (a) blue and red color sharpie, and (b) Scotch vinyl plastic tape, but neither one works well. With (a), the color fades out after 2 or 3 rides. With (b), the tape position tends to slip after 2 or 3 rides. So, I have to re-do the marking every 2 - 3 rides, which has been not convenient. I am wondering someone knows a better way. One way I am thinking is try colored rope whipping such as https://www.amazon.com/Star-Brite-Dip-It-Whip-It-Blister/dp/B001449JMG/ref=sr_1_3?keywords=rope+dip&qid=1558806579&s=gateway&sr=8-3. Your suggestions are appreciated.