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epoxy primer/zinc chromate

Posted: Sat Feb 18, 2012 10:23 am
by bscheube
Hi all,

This is a question that has been asked alot (as my search of the archives has
shown me also seems to have confused me) So I am asking again to see if I can
get a clear picture.

What is the criteria for using the epoxy primer as opposed to the zinc
chromate to prime the mating surfaces, rivets, nutplates etc. is there one. Is
one better than the other. any suggestions would be helpful.
thanks. Bob Scheuber



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epoxy primer/zinc chromate

Posted: Sat Feb 18, 2012 10:23 am
by Wayne G. O'Shea
Bob, both will kill you over time without proper ventilation...but the zinc
types (like you will find in old Cessna's the where seaplane mods) tend to
turn to flakes/powder over time and then you get to breath it in! Stay away
from Zinc...try to find some Epoxy Chromate primer as was the old
Stits/polyfiber EP420/430...but it has been reformulated in the last few
years and the chromate appears to have been removed as well...leaving it as
just Epoxy primer. Anything that you can get between the seams WET and get
riveted down while it is still wet..will greatly reduce any chances of
corrosion in the seams and also helps considerably with shear strength of
panel overlaps.

Wayne

----- Original Message -----
From: <bscheube@dcsol.com>
To: <rebel-builders@dcsol.com>
Sent: Thursday, April 07, 2005 5:50 PM
Subject: epoxy primer/zinc chromate

Hi all,

This is a question that has been asked alot (as my search of the archives
has
shown me also seems to have confused me) So I am asking again to see if I
can
get a clear picture.

What is the criteria for using the epoxy primer as opposed to the zinc
chromate to prime the mating surfaces, rivets, nutplates etc. is there
one. Is
one better than the other. any suggestions would be helpful.
thanks. Bob Scheuber



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epoxy primer/zinc chromate

Posted: Sat Feb 18, 2012 10:24 am
by bscheube
Thanks for the info Wayne
Bob Scheuber
SR191



On 4/7/2005 2:01 PM, OIFA@IRISHFIELD.ON.CA wrote to REBEL-BUILDERS:

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-> From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
-> To: <rebel-builders@dcsol.com>
-> References: <1112910658@dcsol.com>
-> Subject: Re: epoxy primer/zinc chromate
-> Date: Thu, 7 Apr 2005 18:01:05 -0400
-> Organization: O'Shea's Irish Field Aviation
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->
-> Bob, both will kill you over time without proper ventilation...but the zinc
-> types (like you will find in old Cessna's the where seaplane mods) tend to
-> turn to flakes/powder over time and then you get to breath it in! Stay away
-> from Zinc...try to find some Epoxy Chromate primer as was the old
-> Stits/polyfiber EP420/430...but it has been reformulated in the last few
-> years and the chromate appears to have been removed as well...leaving it as
-> just Epoxy primer. Anything that you can get between the seams WET and get
-> riveted down while it is still wet..will greatly reduce any chances of
-> corrosion in the seams and also helps considerably with shear strength of
-> panel overlaps.
->
-> Wayne
->
-> ----- Original Message -----
-> From: <bscheube@dcsol.com>
-> To: <rebel-builders@dcsol.com>
-> Sent: Thursday, April 07, 2005 5:50 PM
-> Subject: epoxy primer/zinc chromate
->
->
-> > Hi all,
-> >
-> > This is a question that has been asked alot (as my search of the archives
-> has
-> > shown me also seems to have confused me) So I am asking again to see if I
-> can
-> > get a clear picture.
-> >
-> > What is the criteria for using the epoxy primer as opposed to the zinc
-> > chromate to prime the mating surfaces, rivets, nutplates etc. is there
-> one. Is
-> > one better than the other. any suggestions would be helpful.
-> > thanks. Bob Scheuber
-> >
-> >
-> >
-> > -----------------------------------------------------------------
-> > List archives located at: https://www.dcsol.com/login?mode=HTML
-> > username "rebel" password "builder"
-> > Subscription services located at:
-> > https://www.dcsol.com/public/code/html-subscribe.htm
-> > List administrator: mike.davis@dcsol.com
-> > -----------------------------------------------------------------
-> >
-> >
-> >
-> >
->
->





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epoxy primer/zinc chromate

Posted: Sat Feb 18, 2012 10:24 am
by Jean Poirier
Hello Bob

Wayne is true when he talk about zinc chromate... but I have work with the
polyfiber primer and I didn't like it. When apply with a acid brush after
good clean up and scothbrite, the primer still want to sometimes "roll"
.... like it do not want to "glue on aluminium" and the price is in the
range of aircraft parts.... Go to a good automobile body products supplier
and ask for a "self etching epoxy primer", better adherance, cheaper and
easy to find

Jean
Rebel 747R
----- Original Message -----
From: <bscheube@dcsol.com>
To: <rebel-builders@dcsol.com>
Sent: Thursday, April 07, 2005 5:50 PM
Subject: epoxy primer/zinc chromate

Hi all,

This is a question that has been asked alot (as my search of the archives
has
shown me also seems to have confused me) So I am asking again to see if I
can
get a clear picture.

What is the criteria for using the epoxy primer as opposed to the zinc
chromate to prime the mating surfaces, rivets, nutplates etc. is there
one. Is
one better than the other. any suggestions would be helpful.
thanks. Bob Scheuber



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epoxy primer/zinc chromate

Posted: Sat Feb 18, 2012 10:24 am
by Wayne G. O'Shea
You could be correct Jean...I haven't had to use any of the non-chromate
EP420 yet....on my last can of the good stuff.!

----- Original Message -----
From: "Jean Poirier" <oxyport@globetrotter.net>
To: <rebel-builders@dcsol.com>
Sent: Thursday, April 07, 2005 8:06 PM
Subject: Re: epoxy primer/zinc chromate

Hello Bob

Wayne is true when he talk about zinc chromate... but I have work with
the
polyfiber primer and I didn't like it. When apply with a acid brush after
good clean up and scothbrite, the primer still want to sometimes "roll"
.... like it do not want to "glue on aluminium" and the price is in the
range of aircraft parts.... Go to a good automobile body products
supplier
and ask for a "self etching epoxy primer", better adherance, cheaper and
easy to find

Jean
Rebel 747R
----- Original Message -----
From: <bscheube@dcsol.com>
To: <rebel-builders@dcsol.com>
Sent: Thursday, April 07, 2005 5:50 PM
Subject: epoxy primer/zinc chromate

Hi all,

This is a question that has been asked alot (as my search of the
archives
has
shown me also seems to have confused me) So I am asking again to see if
I
can
get a clear picture.

What is the criteria for using the epoxy primer as opposed to the zinc
chromate to prime the mating surfaces, rivets, nutplates etc. is there
one. Is
one better than the other. any suggestions would be helpful.
thanks. Bob Scheuber



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epoxy primer/zinc chromate

Posted: Sat Feb 18, 2012 10:24 am
by Ralph Baker
We have used Sherwin Williams 2 part epoxy strontium chromate epoxy on
our Elite. I'm told it is what Boeing uses at their facility here in
South Carolina. There is a solvent that resists high humidity blush
available (which we used). I can put the product numbers on the list if
anyone is interested.
Rallph Baker



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epoxy primer/zinc chromate

Posted: Sat Feb 18, 2012 10:24 am
by Wayne G. O'Shea
Of course we are Ralph....list the Product #'s. :O) Wayne

----- Original Message -----
From: "Ralph Baker" <rebaker@sc.rr.com>
To: <rebel-builders@dcsol.com>
Sent: Thursday, April 07, 2005 9:07 PM
Subject: epoxy primer/zinc chromate

We have used Sherwin Williams 2 part epoxy strontium chromate epoxy on
our Elite. I'm told it is what Boeing uses at their facility here in
South Carolina. There is a solvent that resists high humidity blush
available (which we used). I can put the product numbers on the list if
anyone is interested.
Rallph Baker



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epoxy primer/zinc chromate

Posted: Sat Feb 18, 2012 10:24 am
by bscheube
Thanks Jean,
may have found a good deal on e-bay for some. I am going to give it a try.
Bob SR191



On 4/7/2005 4:16 PM, OIFA@IRISHFIELD.ON.CA wrote to REBEL-BUILDERS:

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216.209.18.167.csolve.net [216.209.18.167])
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-> From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
-> To: <rebel-builders@dcsol.com>
-> References: <1112910658@dcsol.com> <002601c53bce$e2a2f7c0$0500000a@JEAN>
-> Subject: Re: epoxy primer/zinc chromate
-> Date: Thu, 7 Apr 2005 20:16:21 -0400
-> Organization: O'Shea's Irish Field Aviation
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->
-> You could be correct Jean...I haven't had to use any of the non-chromate
-> EP420 yet....on my last can of the good stuff.!
->
-> ----- Original Message -----
-> From: "Jean Poirier" <oxyport@globetrotter.net>
-> To: <rebel-builders@dcsol.com>
-> Sent: Thursday, April 07, 2005 8:06 PM
-> Subject: Re: epoxy primer/zinc chromate
->
->
-> > Hello Bob
-> >
-> > Wayne is true when he talk about zinc chromate... but I have work with
-> the
-> > polyfiber primer and I didn't like it. When apply with a acid brush after
-> > good clean up and scothbrite, the primer still want to sometimes "roll"
-> > .... like it do not want to "glue on aluminium" and the price is in the
-> > range of aircraft parts.... Go to a good automobile body products
-> supplier
-> > and ask for a "self etching epoxy primer", better adherance, cheaper and
-> > easy to find
-> >
-> > Jean
-> > Rebel 747R
-> > ----- Original Message -----
-> > From: <bscheube@dcsol.com>
-> > To: <rebel-builders@dcsol.com>
-> > Sent: Thursday, April 07, 2005 5:50 PM
-> > Subject: epoxy primer/zinc chromate
-> >
-> >
-> > > Hi all,
-> > >
-> > > This is a question that has been asked alot (as my search of the
-> archives
-> > > has
-> > > shown me also seems to have confused me) So I am asking again to see if
-> I
-> > > can
-> > > get a clear picture.
-> > >
-> > > What is the criteria for using the epoxy primer as opposed to the zinc
-> > > chromate to prime the mating surfaces, rivets, nutplates etc. is there
-> > > one. Is
-> > > one better than the other. any suggestions would be helpful.
-> > > thanks. Bob Scheuber
-> > >
-> > >
-> > >
-> > > -----------------------------------------------------------------
-> > > List archives located at: https://www.dcsol.com/login?mode=HTML
-> > > username "rebel" password "builder"
-> > > Subscription services located at:
-> > > https://www.dcsol.com/public/code/html-subscribe.htm
-> > > List administrator: mike.davis@dcsol.com
-> > > -----------------------------------------------------------------
-> > >
-> > >
-> > >
-> > >
-> >
-> >
-> >
-> >
-> >
-> > -----------------------------------------------------------------
-> > List archives located at: https://www.dcsol.com/login?mode=HTML
-> > username "rebel" password "builder"
-> > Subscription services located at:
-> > https://www.dcsol.com/public/code/html-subscribe.htm
-> > List administrator: mike.davis@dcsol.com
-> > -----------------------------------------------------------------
-> >
-> >
-> >
-> >
->
->





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epoxy primer/zinc chromate

Posted: Sat Feb 18, 2012 10:24 am
by Ken
I couldn't tell the difference when they stopped using chromate other
than the streaks in the can when you first start stirring it changed
from black to white...
Ken

Wayne G. O'Shea wrote:
You could be correct Jean...I haven't had to use any of the non-chromate
EP420 yet....on my last can of the good stuff.!




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