I've never used the cream, but it sounds like a good option. They also sell/sold Dicropan, but I believe the OxphoBlue gives you a darker result. Just make sure after you've bead blasted to completely de-grease the metal. Usually a bath in acetone will take care of that. You'll be pleased with the results. It reminds me of the Dulite finish. I put together a youth model 870 Remington for my son years ago and that was the finish it got. Years later the finish has held up well. I think it would be perfect for you requirements!