Good to hear it works well - I will need to make a box, humidity isn't a sure thing here. I got another brand of solution, and their instructions said to go to 320 grit. Do you think 600 made a difference? I suppose I should keep going through the grits until the polish on the barrel matches the old polish job on the receiver.

It occurs to me that my shop light is now LED, and probably doesn't throw enough heat. I'm sure I have an old incandescent somewhere, but I sure don't miss breaking bulbs while under the truck.