I'm considering refinishing a gun with Norrell's. The gun has some minor surface rust, so I plan on removing the rust (Naval Jelly) on the area with rust...i.e., I'm not going to strip the whole finish off the gun. Once that is done, I want to refinishing the metal parts. I've used Norrell's Moly Resin on a few firearms with excellent results. However in each case, I was completely stripping the metal parts, phosphating, then coating. In this case, the majority of the parts are decent shape. Norrell doesn't really say that it's required to abrade the parts. They say the results may be okay without doing so. Has anyone tried applying it on an existing blued finish? Thanks.