I find that colours towards the red end of the spectrum are easier on the eyes, both when sewing sails and when using them, and I think this is because they are absorbing the UV, rather than reflecting it into my eyes as blue does. Silver would be terrible, worse than white, but if light coloured sails are desired, cream colour is not too bad.

White sails are a common choice because white cloth is less expensive to produce - it's not that the cloth is coloured white but that there is an absence of colour - the fibre has not had to go through a dying process. 

A five-year warranty is a five-year warranty.  Significantly, they only give three years on the red, which I suspect fades.

I wouldn't agree that your present colour scheme looks 'heavy', but if you're used to everyone having a white boat, colours can be a bit of a culture shock.  I'd have a coloured sail, myself, but then, I love colours!  Look at my 'avatar'!

Hard Perk wrote: Does anyone know if the Weathermax 80 is one-sided and how well does it last under the sunlight?

I am about to start making a new sail and haven't been able to decide if I should go for Weathermax 80 or Dacron. 

Annie Hill wrote:Unless you are using a very light fabric, puckering is almost always caused by the tension top and bottom being out of sync.  Another possibility is that you need more foot pressure.  I've been surprised what a difference that can make.

Sebastian has now made a number of sails from Weathermax.  He could be your 'go to' man for advice.  (Sorry, Sebastian!)

I am about to start making a new sail and haven't been able to decide if I should go for Weathermax 80 or Dacron. 

I like the yellow :)