Depends on if you are willing to take the metal off the gun and disassemble it.
If so, as was remarked, Prof. Gaddy advised using Behlens Clear Spray. But the frame must be completley disassembled to do this otherwise overspray can gunk up the innards.
I myself would do this if the gun was torn down for overhaul but to date have been to lazy or too much of a coward to do it just for this reason.
If the above applies to you I concur with Prof. Legg, thinned Tru-Oil brushed on will do nicely. The colors will be warmer due to the Tru-Oil's yellow cast, much like the difference between oil paintngs and acrylics.
Rob
