White Board Tape Help

TL;DR I need help finding different colors or a brand that actually works when it comes to diving my whiteboard using tape.

I normally use Duck brand tape to divide my whiteboard up for an agenda and it works really well. But I have a few problems: 1) I can only find the inch wide masking tape for that brand in red, black, and white and would like to use other colors 2) Other colored masking tape I’ve tried all start falling off within a month due to my room being humid due to constant AC (my room is a comp lab with servers so needs to be cold) 3) I’ve tried electrical tape and had issues with residue or also falling off

Do any of you have any recommendations? Figured I’d ask here instead of buying random brands on Amazon. Thanks in advance!