Good news!!! This mod still functions in 1.20. 

OliverRook :

The recipe for resin is 3 pine logs + 10L water, are you using the right quanities? A full barrel of 50L water only needs 15 pine logs.

This mod doesn't seem to be working for me?
I've got a barrel of water and put pine logs in it, but nothing's happening. Can't seal it either.

SK103 I just break the barrel with an axe - it'll drop the barrel and the resin. There's probably a cleaner way to do it, but this works for me!

I might be a little special, but how do you get the resin out of the barrel? I've tried busckets, bowls, clean and dirty pots, even a crockpot and my hands :(

Where could I find modding instructions. There's one that I want to make for the sake of convenience (and scarcity of the material) craftable

I appreciate you sharing this, thank you! ^_^