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  #41  
Old 06-28-2007, 05:44 AM
Kahuna's Avatar
Kahuna Kahuna is offline
 
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Location: Gold Hill, NC25
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Quote:
Originally Posted by Rick6a

Kahuna....you say you built the tanks yourself. Let me ask you this. Did you take the steps I just mentioned and as importantly....did you dab wet sealer around the countersinks before inserting and shooting the rivets? If you did...well I guess I'm back to square one along with everybody else.
I did not dab on each rivet. BUT.. If proseal did not squeeze out from each rivet through the top skin on shooting it, it was drilled out and reset. I also line the rib and rivet after shooting with the stuff.
I have no answers... just questions.
Best
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  #42  
Old 06-28-2007, 06:39 AM
rv72004 rv72004 is offline
 
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Posts: 452
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I did the loctite 290 thing that vans told me to do. The rivet is still leaking avgas .The bubbles are still there .

I feel a bit disapointed ,and dont know what to do next. O Yes, lets send a email to Vans. Keep you posted.

EJ
RV7
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  #43  
Old 07-02-2007, 02:36 PM
n824rv n824rv is offline
 
Join Date: Mar 2005
Posts: 18
Default RV-7A Quickbuild Paint Blisters/Fuel Tank Rivets

I also have a problem with the Paint Blisters/Fuel Tank Rivets on both fuel tanks of my RV-7A quickbuild. I must have 15 blisters on each tank that just apeared this past week. The wings were Veri primed over a year ago and then kolar primer was applied a few months later and then painted with Imron white about 3 months ago. Does anyone have a fix for this. Am I going to have the same problem if I repaint the fuel tanks. Any help will be apprecited
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  #44  
Old 07-02-2007, 03:46 PM
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MrNomad MrNomad is offline
 
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Location: Tucson, AZ
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Smile discussion forum on paint over rivets??

Quote:
Originally Posted by n824rv
......and then painted with Imron white about 3 months ago. Does anyone have a fix for this. Am I going to have the same problem if I repaint the fuel tanks. Any help will be apprecited
IMRON is really tough stuff so if that popped...

IMO this deserves some kind of forum where ideas & data can be combined (Doug??). Within the two weeks I expect to be priming & painting (read lotsa $$$) so this subject is REAL interesting to me. My guess is venting but lotsa planes sit in the sun, few have this problem.

Barry RV9A wiring, paint, then bye bye Mother Earth. After 14 months, we're 30+/- days and a wake up till liftoff
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  #45  
Old 07-02-2007, 09:36 PM
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jdeas jdeas is offline
 
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Default QB Tanks

Just so happens that I am installing a flop tube in an existing QB tank. Here are some shots of the proseal and how it is applied. These tanks were received in the last 6 months.

These are pictures of the first internal rib after removing the outside rib.


They looked OK to me but then look at the back of the rib I removed.

See next post for internal pictures of sealed tank
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  #46  
Old 07-02-2007, 09:43 PM
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jdeas jdeas is offline
 
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Default MoreQB Tank

Here are internal and external shots showing the seal on the outside rib and its rivets.





Is it possible the proseal itself can outgas and cause these problems? The QB tanks seem to have it applied with a heavy hand.
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  #47  
Old 07-02-2007, 10:14 PM
szicree szicree is offline
 
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Boy, looking at those pics brings back some not-so-fond memories.
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  #48  
Old 07-03-2007, 05:12 AM
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Rick6a Rick6a is offline
 
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Quote:
Originally Posted by jdeas
Is it possible the proseal itself can outgas and cause these problems? The QB tanks seem to have it applied with a heavy hand.
I am not at all concerned about the look of the proseal and while seemingly applied with a "heavy hand," it may not look pretty but will not cause anything other than additional weight.

I have had suspicions all along. In fact, I described those suspicions in a recent post to this thread and your detail photos tend to validate those thoughts. Good shop practice would have the builder encapsulate the shop heads of the rivets and I do not see that in your photos. You should not be able to see a shop head. I enclosed photos of a tank constructed a few months ago for comparative purposes. Notice that you cannot see shop heads as they are encapsulated by proseal. If the builder did not seal the shop heads adequately and/or did not seal the countersinks prior to shooting the rivets, it seems very plausible to me that fuel fumes can eventually find a migration route through unsealed rivet holes, especially since some pressure occurs within the fuel tanks.

Van's fuel tank instructions can be a bit ambigious. I quote from Section 7 page 7-7 in the RV-8 manual: "Dab a bit of sealant over every rivet head." Since the context was clearly addressing the inside of the fuel tank, it may have better read "Dab a bit of sealant over every SHOP rivet head."




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Last edited by Rick6a : 07-05-2007 at 05:40 AM. Reason: additional photograph
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  #49  
Old 07-03-2007, 07:15 AM
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MrNomad MrNomad is offline
 
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Location: Tucson, AZ
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Question tank sealant

Another builder friend suggested the use of JEFFCO. Here is the Spruce description:

Jeffco 9700 is a 100% solids epoxy system which is the highest quality fuel and chemical resistant lining and coating material available. It contains no solvents and no corrosive or carcinogenic substances to assure low toxicity and ease of application. Provides superior low temp. curing, impact and abrasion resistance, and cures in the presence of moisture or humidity. Brushes on easily.Sold in 3 gallon kit containing 2 gallons of resin and 1 gallon of hardener. One 3 gallon kit can coat tanks of average size homebuilt. Used extensively on Lancairs and other homebuilts. Shelf life one year.

If it brushes on, it seems to me the $438 price tag could be split by several builders whose only usage is to brush the stuff inside the tank along the top of the tank where the rivets are.

Thoughts?

Barry
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  #50  
Old 07-04-2007, 06:18 AM
Captain Avgas Captain Avgas is offline
 
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Location: Melbourne, Australia
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Default The great mystery

Quote:
Originally Posted by Kahuna
I did not dab on each rivet. BUT.. If proseal did not squeeze out from each rivet through the top skin on shooting it, it was drilled out and reset. I also line the rib and rivet after shooting with the stuff.
I have no answers... just questions.
Best
Does the above statement mean that you applied Proseal to each rivet shop head after it was set ie if one were to look inside your tanks there would not be any rivets showing at all. Is that what you mean.
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