After all the glowing praise here on MCB about Tonsixers in Canada, I attempted contacting them about this very question, and received zero response. I sent 2 MCB PMs and one Facebook PM. When a vendor can't be bothered to reply to a simple question, then it raises a flag in my book about their ability to follow through on any work.
After Tonsixers fell through, I found FX anodizing. I haven't contacted them yet, but am planning on doing so. Seems like they have a good rep so far. I need bare aluminum ano'd in addition to getting a factory CCI silver dust/matte re-ano'd, so I'm hoping they can help, and getting a re-ano done won't be an issue.
FX Anodizing Facebook page... https://www.facebook.com/FXAnodizing