Consult one of the HG manufacturers like Solar or Avian. IIRC Airwave used to use something like sail brite or sail away, but don't use it unless you need it.
Using anything that causes water to form large globules on the leading edge can seriously affect the pitch and stall characterisitcs of a glider as they cause flow break away.
Beware also of not drying the glider out properly after it has got wet as if you store a wet glider in a warm, damp environment mildew will trash the sail.
If the glider is wet dry it out then work out some way of storing it that will keep it dry. Don't store it in a polythene bag with ventilation as this causes condensation and will lead to mildew also.
Steve U.
**************************************************** Steve Uzochukwu, Avian Amour and Nova Xyon.
http://homepages.which.net/~steveu/index.htm
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