> > Paul,
    > > I am working on the plane. Using Alumiprep, Alodine and the
   Variprime.
    > > The alumiprep look like it should, but the Alodine is failing
   to turn
    > > the parts gold toned. I just bought the bottle....
    > > Any ideas?
    > >
    > > --
    > > Blake C. Lewis
    > >
    > > The aluminum is not anodized is it?
    > > Did you acid etch it first before Alodine.
    > > What alloy is it?
    > >
    > > --
    > > Paul Lamar ...No rotor no motor.
    > >
    > > Blake, What's the temperature of the Alodine, I use Alumiprep also
    > > works great even in cool temperatures. However the Alodine
   needs to be
    > > warm at least 65 to 75 F to be active. Then it takes only 3 to 5
    > > minutes to coat the parts. Did you dilute the Alodine from the
   bottle?
    > > I believe the ratio is 2:1 Alodine to water. Matter of fact did
   some
    > > Alodining last night the temp of the mix was 68 when I started
   and 65
    > > when I finished. Parts came out just fine. Regards T.W.
    >
    > I will check my temperatures next time. My shop is heated, but I
    > was venting cold air into it to help with the fumes. I was
   comfortable
    > in a long sleeve t-shirt though. It was 31F outside. The radiant
   floor
    > heat I installed in the shop is so comfortable. everything stays so
    > warm to the touch. I went ahead and painted everything with
   VariPrime.
    > --
    > Blake C. Lewis


   I have had various shades of gold from just a dulling of the bright
   silver
   left by the alumiprep to brown depending on how long I left the part
   exposed
   to the alodine solution. Also old solution does not turn the part
   gold as
   fast as new solution.

   Joe berki
   Limo EZ



Does alodine contain chromium 6 --hexavalent chromium?  If so, be aware
that ch6 is a DNA mutagen; the FDA classifies it as a carcinagen
especially of the lungs and the gastrointestinal/intestinal tract. Check
this out on google. I did not persue finding out the ingredients of
alodine; but I recall hearing this more than a decade ago (after I had
alodined my pars!).Can anyone confirm that alodine does, or does not,
contain ch6?

John Andrich

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