FWIW, that’s essentially just gap-filling with more steps and increased procedural risk; the varnish (polyurethane) is already a component of the spray paint, and the steps as described leave an incredible amount of room for failure on multiple points. It’s reinventing the wheel and boxing it up as a lifehack. 🤌🏼🫣

Trim, sand*, clean, paint*, seal*, bring joy. Simple as.

*as needed