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Thread: Flash rust prevention

  1. #1
    Join Date
    Mar 2009
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    Texas
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    Default Flash rust prevention

    Is there an easy (read “cheap”) way to stop flash rust on cast iron prior to painting?

    I washed a bunch of these washers to get the gunk off and put them in the sun on a piece of corrugated and they quickly developed a light rust coat.

    They are currently in a bucket of molasses and water to get the larger rust chunks off. When done, I plan to paint them.

    Maybe dump them out of the last clean water bath and use the big propane torch?

    B96938CD-9405-4CB6-97AD-D70594EA5390.jpg
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  2. #2
    Join Date
    Oct 2003
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    beer city usa
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    Default Re: Flash rust prevention

    i always return to this post when the need or subject arises
    Originally Posted by CanoeyawlSome years ago I was charged with protecting some valuable machinery during long term storage. This was before internet and involved hours on the telephone. The end result was interesting.

    Some of what I learned was...

    Motor oil absorbs moisture from the atmosphere by design. Not advised
    WD-40 has no corrosion inhibitors
    Marvel Mystery oil has no corrosion inhibitors
    VCI paper, or liquid must be in an airtight container to work.
    LPS-5 works pretty well, needs to be renewed annually, direct exposure to weather will erode it.
    Wax is disappointing, I suspect some types are hygroscopic
    Camelia Oil is expensive, works in a wooden toolbox or cabinet.
    Shellac or Lacquer works better than Boeshield for me.

    edit to add; I spray clear lacquer from a spray can on my table saw, bandsaw, jointer etc. it works great. (I keep this around to protect finished weldments until they are galvanized or painted.
    more here;
    http://www.npl.co.uk/upload/pdf/temp...rotectives.pdf

    edit; looking down the rabbit hole led me here...

    https://www.cortecvci.com/Publicatio...rts/12-227.pdf


    https://www.cortecvci.com/Publicatio...oLine_3690.pdf
    Simpler is better, except when complicated looks really cool.

  3. #3
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    Default Re: Flash rust prevention

    Thanks

  4. #4
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    Jan 2002
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    victoria, australia. (1 address now)
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    Default Re: Flash rust prevention

    I am about to get a collection of old farm ploughs etc sandblasted. Straight from the blasting booth to a lacquer spray booth. We are in a salt air environment and with spray painting as the next step, from we should get about 6 years with touch ups.

  5. #5
    Join Date
    Aug 2000
    Location
    Bay of Islands,N.Z.
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    30,526

    Default Re: Flash rust prevention

    CRC have a product that works well, turns steel black.

  6. #6
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    Oct 2005
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    seattle
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    22,214

    Default Re: Flash rust prevention

    Boeshield T-9

  7. #7
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    Texas
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    Default Re: Flash rust prevention

    I’m hoping for something I can paint over.

  8. #8
    Join Date
    Oct 2003
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    beer city usa
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    Default Re: Flash rust prevention

    Quote Originally Posted by skuthorp View Post
    I am about to get a collection of old farm ploughs etc sandblasted. Straight from the blasting booth to a lacquer spray booth. We are in a salt air environment and with spray painting as the next step, from we should get about 6 years with touch ups.
    instead of sandblasting, you might drag them around through sone dirt behind a tractor
    Simpler is better, except when complicated looks really cool.

  9. #9
    Join Date
    May 2005
    Location
    Bradford, VT
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    11,478

    Default Re: Flash rust prevention

    They unearthed the deadman of a late 19 century pedestrian suspension bridge in Littleton, NH a few years ago, the cables were coated with lanolin and wrapped in deer hide, and were pristine.

  10. #10
    Join Date
    Mar 2008
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    Long Beach, CA
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    3,493

    Default Re: Flash rust prevention

    Ospho.
    Schooner sailors love to get blown offshore!

  11. #11
    Join Date
    Apr 2005
    Location
    Hills of Vermont, USA
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    45,368

    Default Re: Flash rust prevention

    If you're painting - why not just use Rustoleum? 15 or so years ago I painted a rusty dump truck body with it (pressure washed, let dry, painted it) & 5 years later it still looked great.

    Rich was happy with it in his epic wheelbarrow restoration.
    "If it ain't broke, you're not trying." - Red Green

  12. #12
    Join Date
    Apr 2017
    Location
    Kailua, HI
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    415

    Default Re: Flash rust prevention

    Another vote for Oshpo, and allow to dry. Brush off loose residue (if any) and paint.

  13. #13
    Join Date
    Apr 2000
    Location
    Southampton Ont. Canada
    Posts
    7,451

    Default Re: Flash rust prevention

    If you are using alkyd/oil for paint,maybe just splash some paint thinner over the pile.
    Maybe toss the whole bunch into a 5 gallon bucket first.
    R
    Sleep with one eye open.

  14. #14
    Join Date
    Mar 2011
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    Mukilteo, WA
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    3,737

    Default Re: Flash rust prevention

    Penetrol. Put it on the bare steel and then splash a little in the rustoleum when you get to painting.

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