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  #321  
Old 08-17-2011, 07:47 AM
detlef lili detlef lili is offline
 
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Quote:
Originally Posted by rv9av8tr View Post

Has anyone found a successful sealing repair from the outside?
I'm wondering about flush filling the rivets heads with some kind of epoxy
filler.
Hi!
I sanded down the paint to the rivet and covered with one layer of very thin glass with epoxy (West System).
I have again one blister after 3 month.

Detlef
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  #322  
Old 08-17-2011, 08:10 AM
Paul K Paul K is offline
 
Join Date: Mar 2009
Location: Comstock Park, MI
Posts: 911
Default Paint blislters

I am getting ready to paint my QB tanks and will look inside next week to check the quality of the seal. I might also try the green Loctite as an added effort that may help prevent blisters, can't hurt!

Other than that, I am open to suggestions.
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  #323  
Old 08-17-2011, 11:57 AM
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Cfrisella Cfrisella is offline
 
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Location: Sun city, Ca.
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Quote:
Originally Posted by detlef lili View Post
Hi!
I sanded down the paint to the rivet and covered with one layer of very thin glass with epoxy (West System).
I have again one blister after 3 month.

Detlef
Can you tell if the blister raised the glass and epoxy, or has the vapor, creating the blister, seeped through the fiberglass.
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  #324  
Old 08-18-2011, 02:59 AM
jurik jurik is offline
 
Join Date: Apr 2008
Location: Johannesburg, South Africa
Posts: 7
Default My attempted fix

I noticed the blisters only after 6 months but it may have appeared earlier. I removed both tanks, stripped the paint and primer and painted it again. This time however I ensured that I paint over the primer within 12 hours as Vanís think it may be the bonding between the paint and the primer. In a way I tend to agree with this as the primer did not blister, only the paint. It has now been 6 months after repainting and no blisters.
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  #325  
Old 08-18-2011, 01:26 PM
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rv9av8tr rv9av8tr is offline
 
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Location: Portland, OR
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Van's can point their finger at painting all they want. But the reality is it takes a force to lift the paint off the surface and that clearly comes from within the tank. So the root cause is not a paint issue, but a leaking rivet issue. There is no way to fix a poorly assembled QB tank except from the outside. To me, all QB tanks should be approached with great suspecion. There needs to be a reliable way to remedy this externally. Using something like Green Locktite sounds like it might be reasonable place to start. I sure as heck don't intend to build new tanks...
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  #326  
Old 08-19-2011, 08:46 AM
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bsacks05 bsacks05 is offline
 
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I am currently adressing the blister situation with my left tank. The right one is blister free. Both were built by me and not at the same time. I am convinced that I was not careful enough with sealant regarding shop head encapsulation and wet installing rivets.
So....since I am fixing up other issues with the plane, I decided to sand down the paint over the tank rivets and smear some proseal over each head ensuring that it gets between the rivet and the side of the dimples. Some of my rivet heads had gaps between the edge and dimple. I know that sealant repairs should be done from the inside, but I am taking the simplest route first.
I will prime over them soon and report the results.
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  #327  
Old 08-19-2011, 12:32 PM
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rv9av8tr rv9av8tr is offline
 
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Location: Portland, OR
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Default Loctite 290 Wicking formulation

I would think proseal on the outside would leave a visual telltale of "goop" even after painted.

I stumbled on a local RV builder who used Loctite 290 Wicking formulation (it's red rather than green) to seal a leaking rivet. Rather than drawing a vacuum on the tank, he used a shop-vac to pressurize the rivet head. Didn't leak afterwards.

Also found this interesting article: http://www.seqair.com/skunkworks/Mai.../TankLeak.html

I detect a big winter project coming up...
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  #328  
Old 01-05-2012, 11:21 AM
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bret bret is offline
 
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2006 TO 2012 and no answer yet? I did the 290 Loctite method on my QB wings last night just for extra insurance. I am getting ready to paint the wings this week end. So what is the success rate of the Loctite procedure as of now?
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  #329  
Old 01-05-2012, 11:38 AM
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Jeff Vaughan Jeff Vaughan is offline
 
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Default Loctite

All my fixes done with Loctite have held up to 220 hrs. so far

Have developed a few more leaks on other rivets on my QB wings since paint.

Total leaks to date 8.
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  #330  
Old 01-05-2012, 11:45 AM
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bret bret is offline
 
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Quote:
Originally Posted by Jeff Vaughan View Post
All my fixes done with Loctite have held up to 220 hrs. so far

Have developed a few more leaks on other rivets on my QB wings since paint.

Total leaks to date 8.
Are you saying you have leaks on non fuel tank rivets?
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