My final polish is with the Gray 7448 PRO pad, so that's not the issue. I use the Maroon 7447 PRO pad before it. After the tubes have been polished to 320. (Damascus and Twist) It's the steel.
Cold Blue is nothing like the rust bluing process, it's a coating which typically includes Copper Sulphate.
600 grit is not unreasonable for Fluid Steel, 400 is considered the minimum for Field Grade tubes. For Damascus and Twist, you need a little texture for the solution to "Bite". You typically etch the tubes before your first rusting as well.
I agree with the previous posts that suggested the Walther sections were probably colored with a different type solution.
Regards
Ken
Last edited by Ken61; 03/06/17 10:21 AM.
