Tried to use electrical tape and carbon grip paste to protect a new carbon handlebar on my ancient 26" Trek MTB from the 90s:

Worked terribly. Torqued to 5nm, the handlebars would start slipping, rotating down every week. The electrical tape just seemed to make things more slippery. The stem only having two bolts at the handlebar clamp instead of 4 didn't help.

Eventually it slipped on a long trip, I didn't have a torque wrench handy, over-torqued it in frustration trying to get it functional enough to ride home, and CRACK.