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  #11  
Old 01-20-2011, 09:56 AM
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Mel Mel is offline
 
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I have to agree with Scott. I've been using Sherwin Williams wash primer since the mid 1970s and found it to be a very good as a corrosion control. I have had conversations with Sherwin Williams over the matter and they admit that even though it wasn't formulated for that purpose, it works quite well.
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  #12  
Old 01-20-2011, 02:24 PM
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JonJay JonJay is offline
 
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Default Correction on thickness for SW Wash Primer

I apologize as I mistated the thickness. It is not 4 mils, it is .4 mils, dry.
I still stand on my good, better, best approach but will never argue about the merits of anyones own personal choice - It is a choice with pluses and minuses to each.
Good - Alclad
Better - Wash Primer
Best - Epoxy/other designed top coats.

I was not aware that SW Wash Primer had any chromates in it. Learn something new everyday.

If anyone is curious, although not directly RV related, I would be happy to post pictures of various types and levels of corrosion I have found in my restoration work. It is quite eye opening when you actually see the start, middle, and finish of the process. My current project has everything from simple surface corrosion (piting), filiform in the Zinc Oxide coatings, filiform in the base metal, and exfoliation.

If you are doing any kind of regular inspections you should be able to identify the start of a corrosive event and take immediate action to mitigate it before it becomes a structural issue.
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  #13  
Old 01-20-2011, 02:54 PM
rv9aviator rv9aviator is offline
 
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My project is a very slow build, sorry Mel, and the P60 primer I applied 7 years ago looks exactly the same now as it did in 2004. This would be the same as any airplane stored in a dry hanger.
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Last edited by rv9aviator : 12-26-2012 at 03:04 PM.
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  #14  
Old 12-26-2012, 12:14 PM
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What is the process used when spraying the SW primer?

Bob
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  #15  
Old 12-26-2012, 12:31 PM
dhmoose dhmoose is online now
 
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Default SW info

I've used the P60G2 for a few years now and I'm happy with the protection, ease of use, etc. That said, I take respiratory precautions and treat the stuff like "green death" (nickname shared by the SW rep).

SW asks for a 1.5:1 ratio of reducer to primer. I believe Wally at SynergyAir liked a 3:1 ratio instead.

Here the data sheet from SW:

http://www.paintdocs.com/webmsds/web...S&prodno=P60G2

Does this answer your question or were you looking for something else?

David
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  #16  
Old 12-26-2012, 02:59 PM
rv9aviator rv9aviator is offline
 
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The 1.5 to 1 will look splotchy for sure. I used 2 part activator to 1 part paint with good results. Just don't lay it on until you get a dark green color. A light gray green is all you need. A lot of my parts were primed in 2004 and they still look like new with not a hint of corrosion. It would depend on where you live I guess but I'm not close to an ocean and salt water. Another thing, ask for OEM pricing at the Sherwin Williams store. If they will go along with you it will be much cheaper.
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Last edited by rv9aviator : 12-26-2012 at 03:03 PM.
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  #17  
Old 12-26-2012, 04:21 PM
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Spray a light coat on bare aluminum. Compare it to a non-primed piece. If you can see any difference at all, you have enough. VERY little is needed.
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Mel Asberry..DAR since last century
A&P/BGI/EAA (LifeTime) Tech Counselor/Flight Advisor/Nat'l Test Pilot School
Specializing in Amateur-Built and Light-Sport Aircraft
<rvmel(at)icloud.com>
North Texas (8TA5)
RV-6 Flying since 1993, 172hp O-320, 3-Blade Catto (since 2003)Sold
Legend Cub purchased 12/2017
FRIEND of the RV-1
Eagle's Nest Mentor
Recipient of Wright Brothers "Master Pilot" Award
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  #18  
Old 12-26-2012, 06:46 PM
rv9aviator rv9aviator is offline
 
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Exactly! What Mel said.
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  #19  
Old 03-07-2013, 09:17 AM
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wirejock wirejock is offline
 
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Default Pretreatment for Sherwin Williams R7K44

I found this thread reading about primers and decided to use the Sherwin Williams primer.
Question
How are you prepping the surface?
I assume scotch brute maroon pad followed by a wipe with Acetone or similar product.
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  #20  
Old 03-07-2013, 09:55 AM
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Quote:
Originally Posted by wirejock View Post
I found this thread reading about primers and decided to use the Sherwin Williams primer.
Question
How are you prepping the surface?
I assume scotch brute maroon pad followed by a wipe with Acetone or similar product.
You are good to go for interior pieces and things that do not get a top coat. However, for maximum durability, scotch bright maroon is no where near as agressive as I see the pro painters going. I think it is fine for interior surfaces, but for exterior probably not agressive enough. Perhaps some of them can chime in on their prep.
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RV1 - Proud Pilot.
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