From: Allen Jones (jonesal@u.washington.edu)
Date: Tue Feb 05 2002 - 10:48:57 PST
When painting aluminum, I use a two part conversion system prior to sealing
and painting. It's made by Dupont specifically for aluminum and is
comprised of a cleaning and conditioner (part number 225) followed by a
chromatic acid compound (not zinc chromate, but is still yellow) (part
number 226) and it's called something like Alidine (sp?). I used it most
recently on a military arctic top and it worked fine. It stinks like hell
and nitrile gloves didn't hold up very well (insert health and safety
warnings here). Pretty messy too as both products must be thoroughly washed
off with water and thoroughly dried prior to finishing. I followed with a 2
part epoxy primer (like a PPG 90LF or Dupont) and a Gillespie topcoat. It
has good adhesion as I've been beating on it pretty good and no chips so
far.
Allen in Seattle
'55 M38A1
----- Original Message -----
From: "Richard Notton" <Richard@fv623.demon.co.uk>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Tuesday, February 05, 2002 12:17 AM
Subject: Re: [MV] PAINTING ALUMINUM?
>
> ----- Original Message -----
> From: <SETOYOTA@aol.com>
> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
> Sent: Tuesday, February 05, 2002 12:25 AM
> Subject: [MV] PAINTING ALUMINUM?
>
>
> > My question is should this area be primed? and if so with what? Would
it be
> ok to just paint the bare metal since it is aluminum?
> >
> Painting untreated aluminium is largely a waste of time and paint, it'll
all
> fall off again in short order.
>
> >It does not appear that there ever was any type of primer. I know
aircraft
> have a zinc chromate under coat.
> >
> Quite often it seems the factory paint job on MVs leaves a lot to be
desired but
> maximises the makers profits.
>
> Zinc chromate is the stuff, if you can get it. Having seen the hassle
your end
> to even strip old lead based oil paint it seems unlikely that anyone is
going to
> sell this stuff to a non-certified person. The watery greeny-yellow
chromate
> etch is totally effective but comes (here) as a two part product and is,
of
> course, stuffed with cyanide. Unless you are only doing a small item,
outside
> in a remote area on a breezy day standing up-wind, then air-fed breathing
kit is
> needed unless you want to be very ill or worse. To keep the private
dabblers at
> bay this is normally supplied here in 25 litre drums at a huge price,
unless you
> just happen to know the odd, tucked away, supplier who will decant it in
single
> litre quantities. . . .
>
> We also have a somewhat less evil motor trade two part etch which is a
grey/fawn
> colour, this is effective on alloy and face-treated steel sheet (Zintec)
too.
>
> Then there are domestic one part etch primers which cannot hope to equate
to the
> professional stuff.
>
> If you can get it and are happy to handle the stuff, go for the zinc
chromate.
>
> Richard
> Southampton - England
>
>
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