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Thread: What to use to treat minor corrosion on Spar

  1. #1

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    Default What to use to treat minor corrosion on Spar

    Found a critters nest in the wing. Cleaned it out and found some very minor surface corrosion. Cleaned it up with MEK and a scotch brite pad. I'm looking for suggestions for what to use to treat and protect the metal. I don't want to paint it.
    Thanks
    Brian

  2. #2
    Senior Member Esser's Avatar
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    Default Re: What to use to treat minor corrosion on Spar

    I used epoxy primer on mine
    ------------------
    Josh Esser
    Flying SS7
    Rotax 914iS
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    Edmonton, AB, CWL3

  3. #3
    Senior Member HighWing's Avatar
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    Default Re: What to use to treat minor corrosion on Spar

    When I was first building in the late 90s there were products that were used to coat aluminum to prevent corrosion. Checking in Aircraft Spruce, the original brands are not there, but the current materials are BONDERITE C-IC 33 AERO and BONDERITE M-CR 1201 AERO. The first is a prep compound that will remove all corrosion and the second is a conversion coating that will create a chemical surface that is resistant to corrosion. It is frequently used to prevent corrosion in the wings of certified aircraft. Instructions are in the listing at ACS. I used it frequently in the old days as I was always adding things to the airplane and didn't want to paint.
    Last edited by HighWing; 06-21-2017 at 09:03 AM.
    Lowell Fitt
    Goodyear, AZ


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  4. #4
    N213RV's Avatar
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    Default Re: What to use to treat minor corrosion on Spar

    Quote Originally Posted by HighWing View Post
    When I was first building in the late 90s there were products that were used to coat aluminum to prevent corrosion. Checking in Aircraft Spruce, the original brands are not there, but the current materials are BONDERITE C-IC 33 AERO and BONDERITE M-CR 1201 AERO. The first is a prep compound that will remove all corrosion and the second is a conversion coating that will create a chemical surface that is resistant to corrosion. It is frequently used to prevent corrosion in the wings of certified aircraft. Instructions are in the listing at ACS. I used it frequently in the old days as I was always adding things to the airplane and didn't want to paint.
    If you don't want to paint it, then acid etch and alodine might be a good approach.
    -Mike Kraus
    RV-4 built and sold :-(
    RV-10 built and flying
    KitFox SS7 built and flying and now on amphib floats!

  5. #5
    Senior Member jiott's Avatar
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    Default Re: What to use to treat minor corrosion on Spar

    I also used epoxy primer on my aluminum spars, inside and out. Figured someday I may want to put floats on, or operate near salt water.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  6. #6

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    Default Re: What to use to treat minor corrosion on Spar

    Quote Originally Posted by jiott View Post
    I also used epoxy primer on my aluminum spars, inside and out. Figured someday I may want to put floats on, or operate near salt water.
    Jim, I'[m curious, how did you paint the inside of the spar?
    Also, when you sprayed the outside, did you paint the wood ribs too, or did you cover the wood or ??

    Thanks
    Brian

  7. #7
    Senior Member ken nougaret's Avatar
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    Default Re: What to use to treat minor corrosion on Spar

    Quote Originally Posted by southwind32 View Post
    Jim, I'[m curious, how did you paint the inside of the spar?
    Also, when you sprayed the outside, did you paint the wood ribs too, or did you cover the wood or ??

    Thanks
    Brian
    I used an airbrush on a long piece of pvc with epoxy primer to coat the inside of my spars. Ken
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  8. #8
    Senior Member jiott's Avatar
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    Default Re: What to use to treat minor corrosion on Spar

    I painted the inside by putting a tennis ball in one end and pouring some primer in, then jam another tennis ball in that end and tip and slosh the primer all around, then pour out the excess.

    The outside was painted by brush after the ribs were all glued in and varnished. I did not paint over the varnished ribs.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  9. #9

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    Default Re: What to use to treat minor corrosion on Spar

    Alodine is for aluminum ,just be sure to remove all the black pitted in the corrosion.

  10. #10
    Senior Member jmodguy's Avatar
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    Default Re: What to use to treat minor corrosion on Spar

    What color Scotch brite pad did you use?
    Jeff
    KF 5
    340KF

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