My opinion is, screw the lacquer. I don't use it on my guns with case color remaining and don't intend to. Keep a light coating of oil on them and keep it them in the dark.
I've got a Cole custom Beretta that was color case hardened by Doug Turnbull. I emailed Rich Cole about putting lacquer on it and here was his reply: "Even with a coat of lacquer the case colors can wear. I have also seen where moisture has gotten under the lacquer and rusted the surface metal. I am not a fan of coating the case colors of a gun."
