teabaggin said..
I do know that over time the canopy becomes more porous and will allow more wind to pass through it . This will make the kite less powerful than a new kite with exactly the same shape and area . Stretch the canopy over your mouth and blow , feel with your hand how much air goes through and then try it on a new kite . You will feel the difference .
you need to kite more often, kgb( kite gear box) do a kite spray that protects and renews the look of older canopys, an older canopy absorbs water and moisture for sure