This is one of those controversial topics. I plan on flying my Funtana at 3D speeds and I don't think the sealing pays off as much, especially if you have the gap they specify in manual (yours is good). I believe the manual says to try and get it to 1/64th of an inch. They don't tell you to seal it. I'd only seal it if I botched it and the gap was huge (happened to me on a Fun Fly..OOOOPS!!) []

Joe