I used the stock CA hinges, and have had no problem. I feel sorry for those who have problems with their Funtana 90.
It might be the luck of the draw, but I am very excited with mine. In fact this is the best plane I have ever owned/flown in its size (meaning smaller than my 33% Cap).
Yesterday was one of the rare windless days in Hawaii, and I has a blast with my F 90. It is much easier to fly without our usual 10 to 20 Mph wind.[8D]