I am thinking about getting into doing a little bit of refinishing work on my own guns...just something new to tinker with really. What material and grit is a good choice for these applications? Preparation before spraying Duracoat- I see 120grit Aluminum oxide recommended? Just knocking the shine off of a brushed stainless finish? How difficult is it to get a nice even looking finish if the blasted stainless is to be the final finish? How do you protect the muzzle crown when blasting? What else should I know and probably don't? Pictures of different finishes would be great too if possible!