I use outdoor masking tape( at least on the front edge of an 81/2 x11 magnetic sheet with numbers printed on and the corners of the sheet radiused). Seems to work well in the cold/wet. Last time out when temps were warm I didn’t use tape at all.
I suspect the electrical tape might leave sticky hard to clean residue but since I haven’t used it I don’t know for sure. The outdoor masking tape comes off cleanly.