Newbie here...

I recently took a poster printing workshop and the instructor had a band of duct tape "permanently" around the inside edges of the screen to seal the edges/corners. Is this common practice? What is the proper way to do this? How far should the duct tape go "on to" the screen from the aluminum edge? Is this done only on one side?

This is different from the temporary packing-tape coverage where the emulsion stops.

Any advice is appreciated, and a picture would be a bonus.

I have been a graphic designer for apparel screen printing for over 10 years, but I'm setting up my first poster printing station and am trying to learn as much as possible from the forum here.