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03-01-2017, 09:26 AM
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Join Date: Aug 2016
Location: Sarasota, FL
Posts: 38
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THANKS a lot for sharing your detailed process Lynn!! I think I am going to follow your process exactly.
And you brought up another great point, chromates. I was told it is very important that the primer had chromates. And yes I know of safety hazzard with this.
The confusing thing is that the spec sheet for AKZO CA-116 does not mention anything about chromates, only that it is a two-component epoxy primer designed to provide maximum protection from various chemicals, hydraulic fluids, aviation fuels, phosphate ester (Skydrol®) fluids and corrosion causing media.
Does it mention anything about containing chromates on the can?
__________________
Casey M
Sarasota, FL
EAA 180
RV-10
Starting on empennage section - August 2016
Last edited by FL-flyer : 03-01-2017 at 11:51 AM.
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03-01-2017, 09:29 AM
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Join Date: Jan 2005
Location: NC25
Posts: 3,508
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Quote:
Originally Posted by PilotjohnS
If you cant get the rivets in after priming maybe the primer is too thick?
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Why too much primer. When the hole is dimpled, the hole gets a lot larger. In A&P school, I learned that a piece of 0.032 aluminum primed on both sides increases weight by 1%. Any more than that and you used too much primer. 20+ years ago in A&P school we learned that any more than a translucent coating of primer was too much primer.
__________________
Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
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03-01-2017, 09:33 AM
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Join Date: Sep 2013
Location: Ooltewah, TN.
Posts: 580
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The cans themselves have very little info on them. However, I read over the MSDS sheet and seen it had strontium chromates which is why I took the PPE precautions.
http://site.skygeek.com/MSDS/akzonob...gallon-kit.pdf
I am not 100% sure if its a truly chromate based primer, as its main selling point is being an epoxy primer. If memory serves correct, there were a few other older posts on here that mentioned AKZO having chromates in it as well.
__________________
Lynn Dixon
RV-7 Slider -
Tail kit Completed - March 2017
Wing Kit Started - June 2017
My Build Log: http://www.theskunkwerx.com
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03-01-2017, 11:12 AM
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Join Date: Oct 2014
Location: Cedar Rapids, IA
Posts: 232
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Quote:
Originally Posted by FL-flyer
BTW, when prepping your parts for priming with scotchbrite pads do you also use a cleaner or solvent?
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I use PreKote. You spray some PreKote and scrub it down with maroon scotchbrite. This accomplishes the degreasing and mechanical scouring all in one shot. Then rinse with water, use the air hose to dry it off and its ready to prime.
Been working great for me and the akzo is on there for good
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03-01-2017, 11:46 AM
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Join Date: Aug 2016
Location: Sarasota, FL
Posts: 38
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Thanks Lynn and Josh! Great info!
I am also learning that "wash" primers are generally the ones that contain chromates and are designed to be top coated. Call me lazy but I don't want to prime twice, so if the AZKO primer has chromates (which it sounds like) this would be awesome. I am going to reach out to the company just to make sure.
One thing I am very sad about is Vans does not give us any priming options for quick-build kits. They supposedly are using Sherwin Williams P60G2. I would actually be okay with them using P60G2 because it would add a good measure of corrosion resistance since its got chromates but I am told that the P60G2 that they get in the Philippians is crystal clear (as opposed to green in the US/Canada). This makes NO sense to me that they would use a "clear" version of the product or that Sherwin Williams would even make this. Since the primer is clear, its probably also nearly invisible, so you can't see where you are spraying it and who knows if they are even priming all the parts in the QB kits. I'm sure this speeds up production on their end because if they forget to spray a section or two no one would ever know. Kinda reminds me of the magic invisible undercoats that the car dealers would try to sell you in the 1980s.
__________________
Casey M
Sarasota, FL
EAA 180
RV-10
Starting on empennage section - August 2016
Last edited by FL-flyer : 03-01-2017 at 02:22 PM.
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03-02-2017, 05:38 AM
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Join Date: Dec 2015
Location: Auburn, AL
Posts: 200
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I'm using P60G2....it's cheaper, light, and very durable. I figure if it's good enough for Van's, it's good enough for me.
There is a post on the van's builders FB page that show the test coupons that have been hanging outside in the elements for years! The one with P60G2 looks as good as the day it was primed.
__________________
Steve T.
CFII/MEI/ATP 737,DC-10
RV-7 slow build
AUO
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03-02-2017, 08:37 AM
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Join Date: Aug 2016
Location: Sarasota, FL
Posts: 38
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Thanks for that info Steve. BTW, did you have any issues spraying P60G2 with an HVLP spray gun? What ratio did you use?
Thanks
__________________
Casey M
Sarasota, FL
EAA 180
RV-10
Starting on empennage section - August 2016
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03-02-2017, 08:51 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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P60G2
Quote:
Originally Posted by RV74ME
I'm using P60G2....it's cheaper, light, and very durable. I figure if it's good enough for Van's, it's good enough for me.
There is a post on the van's builders FB page that show the test coupons that have been hanging outside in the elements for years! The one with P60G2 looks as good as the day it was primed.
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Same here. They uncovered another section this year and the aluminum was perfect.
Light is good.
I use Bon Ami cleanser and scotchbrite. Cheap. Available at any grocery. No chemicals and safe for the environment. Clean and scuff in one process.
Mix rate is 1 part primer: 2 parts catalyst
Gun is DeVilbiss FLG. HVLP gun at 23 psi.
Spray till you barely see a color change. Very light.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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03-02-2017, 01:33 PM
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Join Date: Dec 2015
Location: Auburn, AL
Posts: 200
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+1 to what Larry said. But i went cheap and I'm using the harbor freight special hvlp gun. 2:1 mix and 50 psi is what works good for me with the purple gun
__________________
Steve T.
CFII/MEI/ATP 737,DC-10
RV-7 slow build
AUO
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03-03-2017, 07:05 AM
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Join Date: Aug 2016
Location: Sarasota, FL
Posts: 38
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Thank you very much Larry, Lynn and Steve!
I really appreciate you sharing all of your ideas. I'm excited to start priming now 
__________________
Casey M
Sarasota, FL
EAA 180
RV-10
Starting on empennage section - August 2016
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