I personally prefer Renaissance Wax for my external firearms protection. I have also used Flitz's Gun Wax in the past with good results. The nice thing about wax as opposed to lacquer is they can easily be removed if required with turpentine.
Wax will not damage case coloring but stay away from anything abrasive like Flitz's polish or Simichrome which will remove case coloring.
Jim

The 2nd Amendment IS an unalienable right.