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.

iCoat Wood Primer Sealer Urethane 2112 1 Gal