Built-in Overflow Problem

Pszemol wrote:
How long are the vertical cuts between teeth ?
Maybe you will be able to cover bottom part of comb on
its whole lenght with a stripe of black plastic - this way
it will look better than pluging each tooth separatelly.
Each cut will be shortened this way and water level will
be lifted up.

I was going to block off two sides and leave the front (each has 4
teeth) using a piece of black plastic. What I can't figure out how to do
is stick the plastic to the overflow without using glue or silicone
since I want it to be easily removable.