[quote=samc99us]My experience is a Pentex Apen 06 or 09 main will last indefinitely. We have some at our club that are nearly 20 years old and still good enough to race with occasionally. I would not compromise with a dacron main that might last 1 or 2 seasons longer, at best. Now if you were sailing in the tropics, I would advise a different strategy.
Your other option may be to purchase a used F18 main, if you can find one. Area wise the F18 main is 0.45 m2 larger, so not too much of a change. Most of that is at the bottom, as the F18 main has a lower clew designed for a boom, and the 570 a higher cut clew designed for boomless operation. IME, most F18 mains will work OK boomless, ideally you would have the foot modified but used sails are never ideal and that is a few $$$ at the local loft to change.[/quote]
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