I'm looking for advise on a finish for a JUMBO Jenga set. I made a test set out of refurbished 2x4s and used a paste mineral wax to finish them. The wax offered the slipperiness that I was looking for but no protection for the wood. I've now invested in a douglas fir hardwood to make a bigger and better set. I live in an area that has 90% humidity levels in summer and I was told that any poly would get a little tacky in the heat and humidity. Any advise would be appreciated.

Time to party!!
It's always an ongoing battle to keep any kind of wood product from self destructing when left outside. Which makes me wonder if you'd be better off just keeping this big toy in the garage when not in use. I'm also thinking that untreated studs may not be the best choice. Have you considered a synthetic?

The best option available to that was the most

The best option available to that was the most cost effective was the Douglas fir. The garage floor was causing some bad dings & scrapes for the original blocks and we only used them 4 times.

I received two suggestions.
1. Deck sealer followed by the paste wax.
2. Marine spar varnish, let it cure for a week then follow with the paste wax.
Thoughts?

I can't offer a lot of insight, but this is an awesome idea! I'll be watching for the solution and just might need to build a set myself.

I did test both options and the varnish did not slide very well under the weight of the blocks on top. Deck sealer is the best option.

Would a good coat of Epoxy work? After it is fully cured wax it.

The biggest problem I see with this is the weight of the boards hitting the ground / each other. They weigh enough that they will get dings and buggered up edges where they will need to be dressed smooth/flat every once in a while. Good luck I hope you find something that works for you.

I agree. I will add that the weight is a concern for if they fall on someone especially smaller people. Not sure how large they will be or how high it may get but a bunch of 2x4's falling over could hurt.

Good luck with it.

Deck sealer would fit your needs