Thanks for the info. I'm doing some research on potential "longer life" materials to use for a main. It would be a beer can and cruising sail. This would be a method to extend the life of the Dacron sail for OD racing. I want to use slugs to flake over the boom for convenience of every day use. I'll post the results of the research on the forum.
Note that this isn't an attempt to start an "arms war" with a better sail for OD racing, merely to come up with a sail that performs well over a longer lifespan. If anyone has experience with different mainsail materials that provide extended life, please let me know.