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Thread: paint or powder coat

  1. #1

    paint or powder coat

    hey,
    is there anyone who knows if you can powder coat you engine mount
    I have been told it makes it harder to see cracks when doing the annual
    is it legal? and or practical.
    also who knows the trick to getting paint to stay on the magnesium landing gear legs.
    Would love to hear from any one who may have some input
    thanks
    jim

  2. #2

    paint or powder coat

    I just powder coated mine. And there are two a&p's on the field I know that also had theirs done on certified aircraft. So I would have to believe it's o.k. It is a lot more durable and nicer looking. It was about 150.00

  3. #3
    I work for a company that makes equipment used in manufacturing operations, and we powder coat our frames for several reasons. It looks better than conventional painting, it is more durable and it is environmentally friendly. Also, the frame serves as a compressed air reservoir, and cracks are easier to detect when powdercoating.

  4. #4
    A BAC site search on "painting magnesium" turned up a post where Mike said the instructions for priming the magnesium is in the maintenance manual. The nasty stuff can be bought pre-mixed from Spruce as mentioned in another post on that thread.

  5. #5
    I'm no coatings expert, and I have seen no discussion threads anywhere that suggested that a motor mount cannot be powder-coated. My personal experience with powder-coated parts suggests that any cracks will actually be easier, rather than harder, to see. If there is abnormal relative motion, the coating tends to crack along the same line. And the smooth, clean coating is easier to keep clean, making it easier to inspect a powder-coated mount.

  6. #6
    I have used powder coatings on airframes for experimential aircraft. The coating is durable and makes for a clean look. The downside is care needs to be taken to ensure the grounds are cleaned off, the bolt holes are reamed to remove excess and the big thing, if a repair is ever needed, the powder coat is difficult to remove for replacing tubing. Make sure who ever does the process uses the latest process and doesn't sandblast the mount to remove the old paint. Shops who usually do cars, motorcycles etc still use sand to clean the tubes. This introduces corrosion and removes material necessary for strength.

  7. #7

    paint or powder coat

    >is there anyone who knows if you can powder coat you engine mount
    >I have been told it makes it harder to see cracks when doing the annual
    >is it legal? and or practical.

    I see no reason that is isn't legal. I've done several. Sure look nice
    and are very durable. Cost a bit, because most commercial shops have a
    minimum charge and one motor mount is all you have. You still need to do
    the same prep for the powder coat that you should for paint, sand to bare
    metal, etch with a phosphoric acid prep, rinse and conversion coat with a
    special steel conversion coating, rinse and dry completely. Wipe with wax
    and grease remover just before running through the powder coat process.

    The very flexible polyurethane paints would probably make it hard to see
    cracks at the welded joints, too.

    >also who knows the trick to getting paint to stay on the magnesium landing
    >gear legs.

    Proper prep is the key. Most A&Ps don't know enough about paint systems to
    properly prepare and paint even Aluminum, much less Magnesium.

    There are special conversion coatings that must be used if you want the
    paint to stick. And you have to use the WHOLE SYSTEM from etch, to
    conversion coating, to primer (epoxy!), to color coat. Best if it is all
    from the same brand, so that you know they all "hold hands" to provide the
    best abrasion resistance.

    The nose gear takes the worst abuse. All the sand on the runway and
    taxiway gets thrown at it by the prop and it is continually "sand blasted".

    Bob Steward, A&P IA
    NIASE Master Paint & Body Tech
    Birmingham, AL

  8. #8

    paint or powder coat

    The conversion coating process for magnesium that Bob refers to isn't all that hard to do. The components are readily available and you can mix up a batch in the kitchen. The attached file is one manufacturer's recommended procedure. Once the conversion is complete, and the primer is applied, it will accept any paint.

    The primer can be found at Deft Chemical Coatings in Irvine Ca., Tempo Paint and Varnish Co. in Weston, Ont., PRC-DeSoto Intnt'l in Mojave, Ca. and Akzo Nobel Aerospace Coatings in Waukegan, Illinois, and a few places in Europe and Japan. This is the green stuff, not yellow.

    Hope this helps.

    Marty Vanover
    Phoenix, Az.

  9. #9

    paint or powder coat

    --- In musketeermail@yahoogroups.com, Martin Vanover <b024700@...>
    wrote:
    >
    > The conversion coating process for magnesium that Bob refers to isn't
    all that hard to do. The components are readily available and you can
    mix up a batch in the kitchen.

    *** very CAREFULLY. Have you seen the MSDS for Chromium Trioxide?
    Ick. Aircraft Spruce sells it as "Magna-Dyne" already mixed. $6.05
    per quart.

    - Jerry Kaidor

  10. #10

    paint or powder coat

    --- In musketeermail@yahoogroups.com, Martin Vanover <b024700@...>
    wrote:
    >
    > The conversion coating process for magnesium that Bob refers to isn't
    all that hard to do. The components are readily available and you can
    mix up a batch in the kitchen.

    *** very CAREFULLY. Have you seen the MSDS for Chromium Trioxide?
    Ick. Aircraft Spruce sells it as "Magna-Dyne" already mixed. $6.05
    per quart.

    - Jerry Kaidor




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