This does not work on Christmas tree branches.
This only sort of works. Yes, it's duct tape. On our Christmas tree.
We bought the biggest Christmas tree this year. It was impossible to pass up - only $10! Our tree is 8 feet tall - twice the size of our usual tree, but only one quarter of the price. We didn't have to traipse through the woods to get it. Nope, it was on an actual lot where all the trees were the $10 flat rate.
Our tree is full, lush and green. But, as we were lifting it into place, a branch snapped. Not just any branch, but one in a prime location... eye level, down front. It would leave a huge empty spot, so I pulled out the super glue. It failed. At last resort, we pulled out some duct tape and, well, stepped into redneck territory for a few minutes.
I keep worrying that someone will blink near the tree and down the branch will tumble. So far, so good. But please, nobody sneeze!
(with and without flash)