Scotch tape won't last very long. Monokote makes a clear covering that you can iron in to the gaps. 3M also makes a tape called "Blenderm" which is made to adhere to your skin well. Skin is somewhat oily. Blenderm is realy tough in an oily environment.

I prefer the monokote solution since it is easier to find but I have used blenderm as a field fix and it works extremely well. It has held up through thousands of laps around pylons.

Sealing the hinge gaps is always a good idea. I always seal mine top and bottom on high performance planes.