The dark wax may darken the finish some but not by much. You may want to go over the cabinet with an aniline stain(water soluble) just don't mix as dark as the direction a little bit will do. But this has to be done before the french polish and waxing. I use shellac flakes but you can also use the clear shellac that comes in a qt can at Lowes or Home Depot. It will work fine if you have to order the flakes but a madder of choice here.