Btw, you'll usually notice the biggest effect when you seal the ailerons, especially on planes with strip ailerons. You usually get a faster roll rate and a more "snappy" feel, ie it feels like the rotation starts and stops more accuratly.

I usually seal the gaps only on the bottom of the ailerons, so you can't see much of anything when the plane is on the ground. I also usually use a bit of covering material, so the color matches.

On my combat planes, I do the entire hinge with tape, then if I'm going to paint, I just paint over the hinge.