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09-24-2013, 04:28 PM
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Join Date: Jan 2007
Location: Benton, Kansas
Posts: 259
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Question about priming tank parts...
....Please do not flame me if this is truly a stupid question. In my past life as an Experimental A&P, Flight Mechanic, and Avionics guy, I have seen deep inside many airplanes. My question is, have any of you primed the inside parts of your fuel tanks? A search on this issue shows a lot of shiny non primered metal in the tank construction photos. Yet certified aircraft I have seen have have the green zinc chromate primer INSIDE the tank. I am starting my tanks, and would like to primer, but obviously don't want avgas dissolving my primer. (Using a 2 part Valspar epoxy primer)
No rock throwing please.....
GB
__________________
Gregg J. Brightwell
Benton, KS
CFII/MEII, ATP, AGI, A&P
-4 Emp and Wings complete!
Fuselage out of the jig!
www.mykitlog.com/gbrightwell
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09-24-2013, 05:13 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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priming tank
I'm close to that stage as well. The consensus from those asked is no. I am working on ribs and scotch brite only the areas where proseal will touch. I suppose if there is water in the tank, it could corrode but that much water would probably be noticed and a bigger problem anyway. 
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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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09-24-2013, 05:15 PM
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Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,002
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me too
Gregg, very timely post. I just primed all my ribs with rattle can duplicolor self etching primer. Kinda did all of them before I thought about these ribs being exposed to fuel. So.....I am very interested in the responses to your question as well.

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09-24-2013, 05:16 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Nothing in the fuel tanks... just a very bad idea.
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Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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09-24-2013, 06:27 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by LifeofReiley
Nothing in the fuel tanks... just a very bad idea.
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Well not exactly....
Alodine is acceptable inside the fuel tanks and will actually slightly improve the adhesion of Proseal, according to the Mil Spec.
However, most builders just clean, and perhaps acid etch, at the Proseal joints in the tanks.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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09-24-2013, 06:30 PM
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Join Date: Nov 2009
Location: Adelaide Australia
Posts: 218
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Quote:
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Nothing in the fuel tanks... just a very bad idea.
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Fuel is a good thing to have in there.
Sorry, coudn't resist that. 
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Phil
LAME (Aust)
RV7 99% finished
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09-24-2013, 06:36 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by PIN 37
Fuel is a good thing to have in there...
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Unless you are on fire.
Sorry, coudn't resist that. 
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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09-24-2013, 07:06 PM
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Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,558
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The RV14 builders manual definitely says "do not prime internal fuel tank parts". Other than alodine as Gil says - which isn't primer - nothing should be done except thorough cleaning. I scotchbrighted all faying surfaces to ensure good pro-seal adhesion prior to cleaning and assembly.
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SH
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019 Flying
Cincinnati, OH/KHAO
JAN2020
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09-24-2013, 08:01 PM
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Join Date: Dec 2012
Location: Atascosa, TX
Posts: 106
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I work on certifieds and can tell you they are still primed internally, in fact, I was just inside the wing tank of a very large cargo yesterday. I definitely will not say don't prime them, but you must think of the reason they are primed as well as the reasons they aren't. The 2 part primer you are debating on using will not dissolve when in contact with the fuel. Many of the certifieds that are primed is to protect the large areas from the corrosion during the times the aircraft tanks are not filled for extended periods, and to protect the metals due to the dissimilarities of the materials to include the vast available fuel types, from Jet A to JP8. Do I think its needed in our applications, no. Would it hurt, have to say no to that as well except by a weight and time standpoint.
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If you are 90% efficient, and your buddy who checks the 10% you missed is also 90% efficient, together you're 99% efficient.
RV-7A - empennage done minus glass
wings nearing completion
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09-24-2013, 08:51 PM
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Join Date: Jan 2007
Location: Benton, Kansas
Posts: 259
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Well, guess it wasn't a stupid question...
...after all. Majority of ye say nay. I WILL alodine rib flanges and skin rivet lines.
I will take as much info as I can get. Time to get these wings DONE. I have a leading edge skin, 4 bottom skins, and 2 single piece top skins to prime. That is a LOT of scotch briting! Was going to prime tank skins, but now just the outside, and alodine inside.
__________________
Gregg J. Brightwell
Benton, KS
CFII/MEII, ATP, AGI, A&P
-4 Emp and Wings complete!
Fuselage out of the jig!
www.mykitlog.com/gbrightwell
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