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02-21-2020, 09:45 AM
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Join Date: Jan 2020
Location: Englewood, OH
Posts: 25
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Priming Questions from A Prospective Builder
To prime or not to prime?
That is the question at hand, from what I can tell this is a controversial subject. What are your opinions? Is it worth it?
Additionally im looking at building in a 2-car sized detached garage at home, I don't have room for a paint booth without building something (possible). Trying to determine if its worth it to prime and if it is, how I will do so in a reasonable manner. It seams that proper primer with the air gun and all is the way to go but this sounds like a lot of extra cost especially when I would have to build a paint booth.
Any and all advice is welcome!
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02-21-2020, 09:54 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Your answer lies in the 331 threads dedicated to the subject in the "never ending debate" section of this forum.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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02-21-2020, 10:11 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,436
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The experiences of folks with corrosion in your area, especially at local airports, will tell you if you need to prime or not.
In a dry area you probably don't. In an area where there's more moisture or industrial pollution, maybe you should.
Dave
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02-21-2020, 10:18 AM
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Join Date: May 2014
Location: Friendswood TX
Posts: 218
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You can prime outside (open air no paint booth required).
__________________
Mark Andrew Tacquard
RV8 N189DK
RV10 in progress
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02-21-2020, 10:28 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Prime
Quote:
Originally Posted by andrewtac
You can prime outside (open air no paint booth required).
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Agreed. I primed most everything outside in a barn. Interior parts were primed and painted in the barn. Often temps were close to freezing.
Whatever you choose, spray it light. Paint weight adds up quick. Especially in the tail. You only need a thin layer to protect for a very long time. That's why I chose P60G2.
If you prime, buy a good respirator or a Hobby Air positive pressure system.
If you prime, research surface prep. No primer will do it's job if the surface is not properly prepped.
__________________
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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02-21-2020, 11:14 AM
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Join Date: Jan 2020
Location: Englewood, OH
Posts: 25
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Quote:
Originally Posted by Toobuilder
Your answer lies in the 331 threads dedicated to the subject in the "never ending debate" section of this forum.
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When I looked there originally it showed me that there were only 4 threads, didn't realize you could sort by how far back it went. Now I see that there are more.
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02-21-2020, 11:42 AM
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been here awhile
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Join Date: Dec 2004
Location: North Alabama
Posts: 4,301
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Quote:
Originally Posted by BTP880
To prime or not to prime?
<snip>
Any and all advice is welcome!
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Ok.....I'll bite.
Here is an article on priming I wrote in 1997 when I was building my RV-6:
http://home.hiwaay.net/~sbuc/journal/priming.html
Flash forward to 2020.....I still fly the RV-6 and it shows no evidence of corrosion. Take this as one datapoint.
Best wishes for a very enjoyable journey!
Last edited by Sam Buchanan : 02-21-2020 at 11:48 AM.
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02-21-2020, 12:04 PM
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Join Date: Jan 2005
Posts: 4,285
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As others said. Sam has a great web site. I am a fan of primer. There are areas you MUST prime. Most areas are optional.
My advice is pick a good aerospace brand of primer AkzoNobel, PPG, Sherwin-Williams for example. Brand not important, but would pick one with a local distributor you can buy direct. You will need etching and alodine solution as well. You will mix the primer stuff two part, and use a cheap spray gun is fine. The good stuff is expensive, but it will do the whole plane. Rattle can is more expensive by ounce and inferior protection.
Second advice paint in batches. Prime a bunch of parts all at one time. You can prime parts you have not fitted and touch up as required. It will save time. Setting up to prime takes time. Last this is hazardous to health. Wear good breathing protection in well ventilated area. I am not kidding.  (PS you do NOT have to put it on thick)
__________________
George
Raleigh, NC Area
RV-4, RV-7, ATP, CFII, MEI, 737/757/767
2020 Dues Paid
Last edited by gmcjetpilot : 02-21-2020 at 01:12 PM.
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02-21-2020, 12:14 PM
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Join Date: Dec 2016
Location: New Braunfels
Posts: 299
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Quote:
Originally Posted by BTP880
Additionally im looking at building in a 2-car sized detached garage at home, I don't have room for a paint booth without building something (possible). Trying to determine if its worth it to prime and if it is, how I will do so in a reasonable manner.
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No comment on whether to prime or not (I am) BUT if you do prime you don't have to have a booth. I used SW self etching primer that Van's uses and LOVED it! Easy to spray outside and dries really quick. The best advice I have is to build a stand like the one in the picture with chicken wire. Allows the air from spray gun to keep parts stable against the screen. Priming small parts on a solid top will blow them all over the place.
I also like this sprayer from 3M. https://www.amazon.com/Accuspray-165...2312071&sr=8-4 Disposable cups and ends and cleanup is easiest ever! Won't give a car like finish, but it's primer.

__________________
Randy Vanstory
Flying RV10 - N783V
1st Flight 08/20/2020
Donation Happily Made 2020
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02-21-2020, 12:40 PM
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Join Date: Jan 2020
Location: Englewood, OH
Posts: 25
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Quote:
Originally Posted by gmcjetpilot
As other said. Sam has a great web site. I am a fan of primer. There are areas you MUST prime. Some optional.
My advice is pick a good aerospace brand of primer AkzoNobel, PPG, Sherwin-Williams for example. Brand not important, but would pick one with a local distributor you can buy direct. You will need etching and alodine solution as well. You will mix this stuff two part primer and use a cheap spray gun is fine. The good stuff is expensive, but it will do the whole plane. Rattle can is more expensive by ounce and inferior protection.
Second advice paint in batches. Prime a bunch of parts all at one time. You can prime parts you have not fitted and touch up as required. It will save time. Setting up to prime takes time. Last this is hazardous to health. Wear good breathing protection in well ventilated area. I am not kidding.  (PS you do NOT have to put it on thick)
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I have found these articles that talk about alternatives to alodine:
http://myrv14build.blogspot.com/p/priming.html
http://rvplane.com/priming/
I like these methods as they avoid having to deal with the alodine. Anyone have any experiance with them?
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