I have an old NP 6.2 Garda sail, made of light Dacron, I believe. It is fine in light winds around 12 knts , however in stronger winds there is no way I can flatten it adequately. Even with the strongest possible outhaul, it still retains a deep shape that makes it heavy and sort of difficult to handle in stronger winds...
I begin to wonder if this is due to overstretching with time..

Thanks

Francone

There will be a little bit of stretching but they were also built with seam shape which in theory will never be pulled dead flat.

They will also have a tight leech so you will never get the proper twist that a modern sail has and will be a bit more of a handful when overpowered especially with a modern board as the fins will probably over load and spin out.

Great sails in the day and OK in light winds but I'd make it into a hammock or bags.

If I remember correctly, 6.2 Garda retailed for around 249 $. Good sails in 1995 retailed around $600 for a 6 meter sail.
You get what you paid for.....then and now.