I seal with a 50/50 mix of Helsman's Urethane/ Mineral spirits.
Prime with BIN red Lable spray can prime
sand smooth between coats then paint then clear with Envirotex-lite epoxy. I wait a day between steps, minimum. I let the epoxy cure for 3 days.
He that would make his own liberty secure, must guard even his enemy from oppression; for if he violates this duty, he establishes a precedent that will reach to himself.
Thomas Paine