Re: how to duracoat a scope and rings
You could use Scotchbrite pads to scuff up the scope and rings. They are available in various grades of abrasiveness. I plan to Duracoat my scope and rings soon, and that is what I'll be using to rough them up with. I know Lowe's sells them in the paint department.
Go to an automotive paint supply store, and pick up some 3M paint tape. It's lime green in color, comes in a wide variety of widths, and works much better than the paint tape sold at home improvement stores.