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  #1  
Old 04-13-2021, 10:32 PM
jetset44 jetset44 is offline
 
Join Date: Nov 2018
Location: Kirkland
Posts: 5
Default Prime or paint underneath carpets?

Got a question for the group. For those of you that installed the optional Flightline Interior, did you prime or paint the floors and sidewalls underneath? My plan right now is to prime and paint the entire cockpit area including the areas covered by the carpets, thinking that will provide better wear and corrosion resistance in these high-wear areas. But Iím beginning to wonder if thatís really worth the weight/time/cost, and whether spraying primer only (no paint) or maybe even leaving the Alclad skins bare would be good enough for structure covered by carpets. Iíll still prime and paint all parts not covered by the carpets, of course.

Same question goes for the fuel tankóare there reasons why it should be primed or painted when it will be mostly covered by the baggage area carpet?

Would appreciate hearing any thoughts or experiences from other builders!

Steve
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  #2  
Old 04-14-2021, 06:36 AM
Bob Y Bob Y is offline
 
Join Date: Jul 2017
Location: Piedmont, SC
Posts: 218
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I chose to prime and paint everything in the interior one piece at a time before installing. My reasons were not knowing what areas might show between the fabric interior parts, like the fuel tank. Also, should I decide for some reason down the road to remove some of the fabric interior panels, I didnít want the bare metal showing. Just my rationale and direction I chose to take.
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  #3  
Old 04-14-2021, 07:15 AM
Desert Rat Desert Rat is offline
 
Join Date: Aug 2018
Location: 50-50 Wichita KS & Scottsdale AZ
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Personally, I'm leaving anything thats going to be covered by interior bare. If I lived on the coast I might reconsider, but there are literally tens of thousands of 70 year old airplanes out there with nothing under the carpet but shiny aluminum.

If it starts to look like its wearing through the alclad, it will likely be around 50 years down the road and since I'll be 104 years old at that point, the next guy can decide what corrosion protection he want to use.
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Last edited by Desert Rat : 04-14-2021 at 07:20 AM.
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  #4  
Old 04-14-2021, 07:55 AM
N8DAV8R N8DAV8R is offline
 
Join Date: Apr 2007
Location: Salida, Ca
Posts: 37
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I'm still in process on my fuse but I'm also painting essentially everything in the interior as I go. I'm also installing all of the options available for interior trim. A few things lead me down this path, all just personal preferences for how I wanted my airplane to be when completed. The majority of my interior is being painted with Jetflex WR, but I have done all of the 'floor surfaces' from firewall to rear bulkhead in a dark grey textured mutli-color rattle can.

The rest of my build is not primed. The lower center section of the fuse is primed because I used that as a warm up for getting my prep, prime, and paint process planned out and well rehearsed before I get to the interior parts. I stay in the 'make your own decision' when it comes to priming or not and I don't think it's necessary in the areas you are asking about. The only suggestion I would make is that it's just a few pieces and they may present you with an opportunity to practice with whatever paint you will use elsewhere on actual airplane parts. Test spray some scrap, then setup your process on and go through it on the floor pieces. They are a good place to do your first painting, if they aren't perfect you aren't going to see them but in general they will match or coordinate with the rest of your interior.
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  #5  
Old 04-14-2021, 11:15 AM
Roadjunkie1's Avatar
Roadjunkie1 Roadjunkie1 is offline
 
Join Date: Jun 2017
Location: Erie, Colorado
Posts: 162
Default P.....Pr......Priming......

Well, huh.... This is a variation on the Primer War Threads...

Carpet can be a collector of moisture from the environment, leaks or carless passengers. And that can cause corrosion. I have inspected several Spam Cans that came from the coast that are now in a dry environment and have corrosion in carpeted areas that started in that humid environment. I have seen enough corrosion in wings (again, costal airplanes but not always) that my interior is primed. It does not have to be a heavy coat. It would be WAY easier to just prime those areas now than trying to do it with the airplane put together.

Do NOT put foam insulation under the carpet. There are photos in this forum of floor pans that have rotted away....

Do you care what your airplane will look like in 75 years? My Cub was born in 1946 and has been well taken care of since. When you pass it on to the Next Keeper, you will want them to have a good airplane.....that you built.....

IMHO.........

Photo: my A&P inspecting the tail of the fuselage while I am making modifications..... You can see the LIGHT layer of primer.....
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Last edited by Roadjunkie1 : 04-14-2021 at 12:07 PM. Reason: Photos
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  #6  
Old 04-14-2021, 07:29 PM
DeltaFox DeltaFox is offline
 
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Location: chesapeake, va
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YMMV, but I primed everything with Akzo Nobel primer. Very light weight, super fast drying, and tough as nails. It's probably been 5 or 6 years since I primed the floors and they still look brand new. I'm with Roadjunkie on this one. It would be pretty easy to get some moisture under there and not notice. The foam fills up the channels and the carpet is over the top - you'd never see it unless you took it all out. For me that's once a year during my condition inspection. Once you start getting corrosion on aluminum it is hard to stop.

Prior to finishing my -9 I was a partner in a 1970 Cherokee. It had been lightly primed with what looked like zinc chromate. It was almost transparent in a lot of places. After 50 years still no corrosion. Cheap insurance. If you do it as you go (I primed before riveting anything) it's pretty easy.
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  #7  
Old 04-14-2021, 07:43 PM
Kyle Boatright Kyle Boatright is offline
 
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Location: Atlanta, GA
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One of those individual preferences. Paint and primer equal weight, time, and money. And probably corrosion and abrasion resistance.

Make a choice and move on. ;-) You'll probably be happy either way.
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  #8  
Old 04-15-2021, 12:02 AM
jetset44 jetset44 is offline
 
Join Date: Nov 2018
Location: Kirkland
Posts: 5
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Thank you all for the great feedback! Like so many things with building airplanes, I know there isn't a wrong or right decision on this one--just matters of preference. I hadn't thought about the carpets retaining moisture, that's a really good point. So I think I'll stick with my original plan to lightly prime and paint the entire cockpit interior.

Still curious to hear if anyone has any thoughts about the fuel tank, since it's a unique aspect of the RV-12. I'll definitely prime the outside of it even though most of it is covered by carpet, but are there any reasons why it may be better or worse to paint the fuel tank?
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  #9  
Old 04-15-2021, 06:23 AM
Bob Y Bob Y is offline
 
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Location: Piedmont, SC
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Just depends on how much non-painted areas youíre ok with being exposed. This is the only photo I have of the tank after installation in mine. The forward side is exposed. The tops of the attachment ears on each end are exposed too.

https://www.dropbox.com/s/pl1jw1xjzv...%2002.jpg?dl=0
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  #10  
Old 04-15-2021, 06:47 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
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Quote:
Originally Posted by Kyle Boatright View Post
One of those individual preferences. Paint and primer equal weight, time, and money. And probably corrosion and abrasion resistance.

Make a choice and move on. ;-) You'll probably be happy either way.
+1 .
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