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Thread: [musketeermail] Primer Woes

  1. #1

    [musketeermail] Primer Woes

    Forget the zinc chromate lacquer primer, and don't worry about the lack of zinc. That was far more important in the days preceding the 2-part epoxies. I frequently encountered adhesion and corrosion issues with the zinc chromate lacquer, but have never had a failure (so far) with the epoxy (neither substrate or topcoat adhesion failure, or substrate corrosion.

    Out of curiosity, does the repair preclude polishing your prop? I buffer-polished my Sierra's spinner fifteen years ago, and have maintained it with periodic hand polishing ever since (every few months or so). The polishing is actually less of a hassle than constant paint touch-ups.


    ---------- Original Message ----------------------------------
    From: "ke4oh" <ke4oh@yahoo.com>
    Date: Wed, 21 Dec 2005 17:38:54 -0000

    <html><body>


    <tt>
    Jerry,<BR>
    <BR>
    Seriously, I think you are obsessing about nothing. Chances are the <BR>
    spinner will develop a new crack before corrosion sets in. In 22 <BR>
    years of flying and owning, I've seen some aluminum (and magnesium) <BR>
    corrosion on planes. I've yet to run into a corroded spinner.<BR>
    <BR>
    FWIW, I lost 2 spinners and 3 spinner bulkhead to cracks in the first <BR>
    2 years I owned my Super (fixed pitch prop). I had my prop overhauled <BR>
    a year ago. No more cracks. There may be a connection.<BR>
    <BR>
    Best regards,<BR>
    <BR>
    Steve Robertson<BR>
    N4732J 1967 Super III<BR>
    <BR>
    --- In musketeermail@yahoogroups.com, "Jerry Kaidor" <jerry@t...> <BR>
    wrote:<BR>
    ><BR>
    > Hello,<BR>
    > <BR>
    > My cracked spinner just came back from the repair station looking<BR>
    > beautiful, and with a yellow tag attached. Time to paint it...<BR>
    > <BR>
    > The process used to be:<BR>
    > <BR>
    > * Clean the aluminum with "Alumiprep"<BR>
    > * Treat it with "Alodine"<BR>
    > * Paint it with a zinc-chromate epoxy primer.<BR>
    > <BR>
    > OK, Alumiprep & Alodine are still available. But I hit a snag <BR>
    with the<BR>
    > primer. What I used to use was PPG DP40, which is a two-part primer<BR>
    > that<BR>
    > looks like baby puke and dries hard as a rock. DP40 contained <BR>
    zinc. Zinc<BR>
    > is important because it likes to corrode. Moisture attacking a <BR>
    zinc-treated<BR>
    > aluminum panel will prefer to corrode the zinc, and will leave the<BR>
    > aluminum alone.<BR>
    > <BR>
    > DP-40 is alas gone. The new replacement DPLF-40 is still the <BR>
    proper<BR>
    > bilious green, but contains no zinc. The can proclaims "No <BR>
    Chrome!". <BR>
    > The<BR>
    > bilious green is apparently attained with useless pigments.<BR>
    > <BR>
    > A cursory web search did not reveal any source of zinc-chromate <BR>
    epoxy<BR>
    > primer. It seems to have been regulated out of the market. <BR>
    > Zinc-chromate<BR>
    > lacquer primer is still available.<BR>
    > <BR>
    > If this was an interior part, I wouldn't worry about it much - <BR>
    just prime<BR>
    > with zinc chromate. But the spinner is in front of the airplane <BR>
    turning<BR>
    > 2500RPM and being blasted by 125MPH winds. Mechanical strength is<BR>
    > important.<BR>
    > <BR>
    > Looks like I might have to just punt and use the DPLF40 ( <BR>
    actually,<BR>
    > DPLF48,which is white ) and depend on the alodining and the superior<BR>
    > sealing properties of the epoxy primer to keep the aluminum from<BR>
    > corroding.<BR>
    > <BR>
    > Comments?<BR>
    > <BR>
    > - Jerry Kaidor ( jerry@t... )<BR>
    ><BR>
    <BR>
    <BR>
    <BR>
    <BR>
    </tt>


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  2. #2

    [musketeermail] Primer Woes

    >
    > Forget the zinc chromate lacquer primer,
    *** Will do. Am planning to prime with DPLF48 ( white epoxy primer ) and
    topcoat with Durathane ( two-part urethane enamel ).

    >
    > Out of curiosity, does the repair preclude polishing your prop? I
    > buffer-polished my Sierra's spinner fifteen years ago, and have maintained
    > it with periodic hand polishing ever since (every few months or so). The
    > polishing is actually less of a hassle than constant paint touch-ups.

    *** Mike,

    I used to have a polished Cessna 170. I pretty much got all the
    polishing out of my system with that one . Maybe some day when I
    get rich with a country estate and a hangar.

    Also, the welds are a slightly different color than the base metal.

    - Jerry "not rich" Kaidor ( jerry@tr2.com )


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