I seal all my hindges, for aerodynamic enhancement as well as added security. A note which you my find interesting, back when I was into soaring (full scale) we always sealed the ailerom hinges with flexible tape, I would even have the canopy sealed after I was in. Any fairing or sealing makes a difference, did you realize that a 'round' red beacon light on a plane produces the same drag a the full verticle stab if it is unfaired sitting on top of the rudder? Round = drag, thats why stuts etceteras are airfoil shaped. I even use fairings on exposed servos, even though small, the exposed flat edge in the windstream is drag, especially important in pattern and formula racers. I found it interesting in the latest Model Airplane News seeing the pictures of unlimited racers with exposed external servos, can't understand that concept.

Len