Gary,
even those who cruise a good deal around the coast, will stay most of the time at anchor or in the marina (or on the trailer). With a half-decent sail cover, the Odyssey should last for a good while. However, I think that is on the heavy side for sails in the 20sqm category, or below that. I noticed that the 20sqm sail for my ‘Frøken Sørensen’ could be a bit reluctant to inflate its panels properly in very light winds. The 35sqm sail of my present ‘Ingeborg’, taken from the same roll of Odyssey III, does much better.
I therefore suggest you look for some lighter cloth for the JR of a TS16, say 150g/sqm or 4oz.
good luck!
Arne