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Thread: Scratches in fermenter

  1. #1
    Join Date
    Jan 2009
    Posts
    44

    Scratches in fermenter

    What's the best way to remove scratches in the fermenter?
    Last edited by BigMuddyBrewing; 05-06-2009 at 09:07 AM.

  2. #2
    Join Date
    Jun 2005
    Location
    Greensboro, VT
    Posts
    190

    sandpaper?

    Maybe try 150+ grit sandpaper - and then passivate?

  3. #3
    Join Date
    Mar 2004
    Location
    Greeneville, TN
    Posts
    224
    I would expect that 150 grit would do more damage than good. I would try ultra fine paper for automotive use. Most places carry up to 2000 grit which will polish to a very high sheen.

    Mike
    Mike Pensinger
    Chief Brewer
    Holston River Brewing Company
    Bristol, TN

  4. #4
    Join Date
    Aug 2008
    Location
    Dublin, Ireland
    Posts
    144
    Depends on how deep they are. Buffing with a fine-grit compound will be the least trouble for superficial scratches. If you need to dig in a bit, I would recommend silicon-carbide, wet-or-dry paper with soapy water. Start with the smallest grit you can use effectively, no coarser than 400 under any circumstances. Take it up to 600, then 1,000 or 1,200, then buff. Assiduously clean away all the residue after each step so you don't grind coarser particles into the metal from the previous treatment. Your patience will be rewarded.

  5. #5
    Join Date
    Jan 2009
    Posts
    44

    Thanks for the great feedback!

    Thanks for the great feedback!

  6. #6
    Join Date
    Apr 2009
    Posts
    9
    Try a unitized wheel from 3M. They come in different grits and are made for taking scratches out of stainless. Some leave a 3a or 2a compatible finish. These use no compound and need no pasivation when finished.

  7. #7
    Join Date
    Jan 2003
    Location
    Palau
    Posts
    1,510
    Are your scratches deep, or just minor surface imperfections that may be the same depth as the surrounding metal finish, only brushed in a different direction so that it is noticeable? Scratches may be OK, but gouges should be ground out. Most brewers tend to overestimate stainless steel finishes. Can't tell you how many brewers are adamant about not touching the interior of a tank with a 3M scrubbie for fear of leaving "scratches". In fact, this is the best way to obtain a superior finish on stainless. A standard 2B finish is obtained via cold rolling. It cannot be exactly duplicated by grinding, polishing, or buffing. That said, it is a fairly rough finish. Many (most?) equipment suppliers leave the interior at 2B and back-grind & polish the welds. The "equivalent" grit to a 2B finish is less than 150 grit. 3B is about 180 grit. #4 finish is about 240 grit. Unless you have mirror surfaces on the inside of your fermenter, I wouldn't go beyond 240. And this may be overkill compared to a 2B finish on the rest of the tank interior. Good luck!
    Phillip Kelm
    Palau Brewing Company

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