I use a one foot long thin stainless steel thing ruler to do my sealing. Just place the ruler all the way down to the CA hinge and iron the 1/4 inch of ultracoat to the outside flats of the hinges. Absolute piece of cake. I only do ailerons but the other surfaces can be done too. It's so easy that, if you are a serious flyer, why not do such a simple 15 minute task? With the big control throws of the 3D planes these days, the only way to get them to 60% is to leave a bigger gap in the hinge. If you leave too little of a gap, the control surface will bottom out on the wing long before it reaches 45%. The only other solution is to sand down (bevel) your control surfaces near the hinge. Forget that.

Joe