Alex wrote:

[...]I would welcome advice on what cloth and webbing to use bearing in mind the boat is a day sailer and although 15 knots of breeze will be common around here, to be out in 25 knots would be unlikely. [...]

Hello Alex,

I have been very happy with the WeatherMAX 65 (Sometimes called WeatherMAX LT) that I used for my sail. It weighs 6.5 oz per square yard compared to the 8.0 oz of the 'normal' WeatherMAX that other JRA members have used.

I ordered it from Seattle Fabrics. 

Assuming I followed all the links correctly then I think it should be available from Contender Sailcloth in Australia.

I have not used the heavier WeatherMAX but I have to assume the WM 6.5 is much easier to sew. The two sides of the fabric are identical as far as I can tell and I can't imagine the fabric would be too light for a JR sail of any size.

I am less confident that I picked the best webbing and other sail materials, but I really like this fabric. I would like to see someone else use it and confirm that it is a good choice.

I'm sorry that nobody has replied to you earlier: most unlike the JRA!

Choosing light, UV-resistant canvas isn't that easy, and it's not made any better by the fact that so few boats are out in strong sunlight for any lenght of time.  I've been happy with my Weathermax up to now (2+ years), although an acquaintance complained that his had deteriorated badly in the Tropics.  There is a lighterweight Weathermax available.

As to webbing.Don't be tempted by polypropylene which deteriorates very rapidly in sunshine - and isn't particularly strong.  The black, polyester webbing that most sailmakers use lasts for years.  I have always found sailmakers incredibly obliging people and if you go to the one nearest to you, I'm sure they will order you a reel of webbing so that you know you're getting the right stuff.

Hopefully, with this reply taking the topic back up to the top, someone else will chip in.