Don't use tape, seal it with covering. I think most covering manufacturers still offer the clear.
When you do this it's very important to fully deflect the control surface in the opposing direction of the side you are sealing.
If you are still concerned about dirt, or subsequent build up in the gap, you can seal both top and bottom, or in the case of the rudder, both left and right.
For hinges, some modelers use two 1/2 to 3/4 inch strips,
seal it on the centerline on their bench (non sticky sides opposing), then apply it to the surface with the sealed centerline in the hinge gap.
Usually done on smaller than 40 size A/C.
This accomplishes both the sealing and hinge installation in one step.
Happy Flying!


Tom