Hi this is Peggy. I think you are looking for resin epoxy. Hope this is helpful. How to Seal Wood With Epoxy Resin | Hunker
Epoxy can give wood a waterproof, resilient finish. In most cases, it is an ideal coating for woodprojects that will be exposed to moisture or wear. ... Pour epoxy resin and hardener into a clean coffee can.
Any brand of two part epoxy resin.
I used pour on resin by ETI.
If you're looking for a finish.... its called Spar Varnish. I get mine at True Value hardware store.
My favorite brand is Stonecoat countertops epoxy. :)
Here is a link so you can check it out.https://www.stonecoatcountertops.com