Fast-drying Urethane sealer can have multiple layers and can be sanded. The best way to seal wood preventing and mitigating outgassing/bubbles that may form on wood projects prior to coating with epoxy.
Also works great as a sealer for wood decks and in places that moisture becomes present.
Instead of using fast-set epoxies that have a tendency to yellow, use 2112 as your base coat on tumblers so you can get all the bling onto them before adding the epoxy clear coat.
1 Gallon Bottle