A good article on shellac. The author is a long time instructor at a finishing school. I smiled at his comment, do you really need poly on a jewelry box or clock?
What he does not mention is that Bullseye (except for the aerosol version) is a waxed shellac; Seal Coat is dewaxed. This is important if you plan to put another finish like varnish or water-borne on top -- you want a dewaxed version.
https://www.popularwoodworking.com/finishing/brushing-shellac-2/?utm_campaign=PWW - NL - Sunday Newsletter&utm_medium=email&_hsmi=203011645&_hsenc=p2ANqtz-8LBuwuA9TOYf3kNNTlzTPXPNFTJmfwXUX_eEwDO3ix4qRa0pqSJ8LQZVJmApD4gcLcGnPTKgLqTvrPYfTazFWMvF-pGS9QMYDfV1k8_RwPePqkjHM&utm_content=203009238&utm_source=hs_email#