Yeah. It can take a while - especially if your air compressor can't maintain the high psi for very long. Then you have to do it in short bursts followed by waiting.
I don't know about a 1" thinwall, but in the blades I've done it hasn't done it evenly; that is, the end closest to the gun gets finished faster. It eventually reaches a point where it doesn't get any more frosted. You just keep going until the whole blade is even.
It also helps if you switch the blade around and go from the other end part of the time.
Have fun!
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