I wax dipped some bottles:
https://www.homebrewtalk.com/f12/dfh-120-minute-clone-259314/index5.html#post3388462
They turned out really nice. I followed the advice of this thread:
https://www.homebrewtalk.com/f35/hot-glue-bottle-wax-experiment-127485/
What I learned from it:
-I used a ratio of 12 crayons and 20 glue sticks (if you use the mini ones, it's more like 36). The consistency was good.
-A double boiler won't provide enough heat. I heated my wax in a soup can i stuck in the oven. If you have a gas stovetop, that'll work.
-Stir, stir and stir. You have to keep the consistency even.
-I needed about 16 crayons and 50 mini glue sticks to do 40 bottles. It was barely enough.
-The visual effect is really cool, it's worth the effort.
I'm brewing a big Russian Imperial Stout soon that I plan to do the same with only in black or grey.