He wont be racing with a CDI furler! I've been told that using a UV protector with anything other than Dacron sails can damage the sail by overheating it causing it to shrink unevenly. We use a harken furler with pentex sails but we always remove them after the race and store below.
The cost of. changing the tape will depend on the size of the luff. A few years back. I had a sailmaker change the tape on a headsail with a 30' luff and it only cost $200 or so. Mylar wont be a very good choice for a long lasting sail as SD points out the laminated construction has some issues.
Last edited by Sabre66; 04-01-2007 at 12:20 AM.