Hi Luke - This is the perfect time to use a Multi-Layer appearance.
You would first create an appearance to represent your wood like this: (Untitled 2.jpg)
Then, create another new appearance that is the lacquer. It should be a Glass type with solid enabled. It should represent the color or tint of your lacquer.
Lastly, create your final appearance and set it to a Multi-Layer type. Load the wood appearance first and the laquor second. (Multi-layer are in order of bottom-most layer to top-most). The final result should look like this: (Untitled 3.jpg)
I've also attached the Appearance file which you can just drag and drop onto a part in Visualize to import and see.