Can Feed-N-Wax be applied over a tung oil finish, polyurethane finish, varnish, lacquer, wood finish?

Yes, Feed-N-Wax is compatible with all cured (fully dry) clear coat finishes including; tung oil finish, polyurethane finish, varnish and lacquer wood finishes. Feed-N-Wax adds a protective coating of beeswax and carnauba wax that helps prolong the life of the finish.