I can't advise you on DuraCoat but I can add a bit of info on blast cleaning. I bought a soda blaster for use on motorcycle carbs and break calipers. I've found that it cleans things very will without damaging anything. I highly recommend it.
I got my blaster at Harbor Freight. You can use their soda or by it elsewhere. I got my first 6 pound bag a CostCo then later bought 50 pounds and HF...
I've found that I can just hose away the soda after I'm done blasting in the drive way and my wife says the over spray kills the moss in the front yard...
Tony
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