u/Interesting-Car739

I want to create wooden volumes for crack climbing. I'm not sure if this is the place, or if there is a better place to ask, but this is what I found.

The idea is to build something similar to the wide Boyz volumes, and the mane problem I'm having is that I don't know what to use for the coating. My vision is to have some comfortable surface on the inner part where you jam, and slippery no tex on the outside.

If anyone knows anything about how to apply these kinds of finishes or know of someone who does, I'll appreciate it a lot.