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Tank repair

 
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Jim Feldmann



Joined: 01 Sep 2008
Posts: 54
Location: Burbank, CA

PostPosted: Tue Feb 10, 2009 8:53 am    Post subject: Tank repair Reply with quote

I have the fiberglass wing tanks. They have been sloshed and they look very good inside, except for some small spots directly under the filler cap. Apparently ham-handed gas jockeys have hit the bottom of the tank with the nozzle and broken through the slosh coating and now the glass is deteriorating.

I can reach those spots easily, but I don't know what to use to repair them. As an RC modeler for many years, my first choice would be Cyanoacrylate (Super Glue). Has anyone had good results with anything else?

What should I use to clean the area before repairing it?

Thanks


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Jim Feldmann
Kitfox IV Speedster / 912 lost to prop failure
Building a Kitfox 5 Voyager
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Guy Buchanan



Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA

PostPosted: Tue Feb 10, 2009 9:39 am    Post subject: Tank repair Reply with quote

At 08:53 AM 2/10/2009, you wrote:
Quote:
I have the fiberglass wing tanks. They have been sloshed and they
look very good inside, except for some small spots directly under
the filler cap. Apparently ham-handed gas jockeys have hit the
bottom of the tank with the nozzle and broken through the slosh
coating and now the glass is deteriorating.

Jim,
What's failed, the Kreem coating, or is the glass shattered?
If the Kreem coating I assume you could rub the local area with MEK
to form some kind of blend, then re-coat with Kreem. I don't know how
fuel resistant CYA is, or whether it would bond to Kreem, which is
what you want to have happen.
If the glass has been locally damaged, then you're right,
thin CYA can often be wicked into the fibers to stabilize the matrix.
You'd then want to re-coat locally with Kreem. Just whatever you do,
don't use a heat gun on it. Wink
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.


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Guy Buchanan
Deceased K-IV 1200
A glider pilot too.
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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Tue Feb 10, 2009 9:45 am    Post subject: Tank repair Reply with quote

Why not use what the tank is built from...fiberglass. If it was me,
I'd clean the area with MEK or acetone, stick a Dremel in there to
scuff it up, or a long dowel with sandpaper glued to the end, or any
other such tool to roughen the area, then apply some chopped
fiberglass and resin to the area for reinforcement, and finally
follow up with a new Kreem treatment, if this is what it had before.

Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 605 hrs
Sensenich 62x46
Electroair direct-fire ignition system
New skis done and flying
do not archive

On Feb 10, 2009, at 11:53 AM, Jim Feldmann wrote:

Quote:

<feldesign(at)earthlink.net>

I have the fiberglass wing tanks. They have been sloshed and they
look very good inside, except for some small spots directly under
the filler cap. Apparently ham-handed gas jockeys have hit the
bottom of the tank with the nozzle and broken through the slosh
coating and now the glass is deteriorating.

I can reach those spots easily, but I don't know what to use to
repair them. As an RC modeler for many years, my first choice
would be Cyanoacrylate (Super Glue). Has anyone had good results
with anything else?

What should I use to clean the area before repairing it?

Thanks

--------
Jim Feldmann, 3rd owner
1994 Kitfox IV Speedster / 912
Down for engine work


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p 29555#229555




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Lynn
Kitfox IV-Jabiru 2200
N369LM
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Jim Feldmann



Joined: 01 Sep 2008
Posts: 54
Location: Burbank, CA

PostPosted: Tue Feb 10, 2009 10:13 am    Post subject: Re: Tank repair Reply with quote

Thanks guys'

I don't know what the slosh material is. The builders documentation does not mention it. I also don't know whether the fiberglass resin is polyester or epoxy. As you probably know, applying one type over the other does not work. Maybe John McBean can tell me which was used in this 1992 kit.

CA is 100% fuel proof (gas, oil and methanol) but as you point out, there may be issues with it adhering to the slosh material. I will do a test.

I have Acetone on hand. Will that work as well as MEK for cleaning?

Jim


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Jim Feldmann
Kitfox IV Speedster / 912 lost to prop failure
Building a Kitfox 5 Voyager
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vadert(at)shaw.ca
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PostPosted: Tue Feb 10, 2009 10:14 am    Post subject: Tank repair Reply with quote

Jim
When rebuilding my wings I sloshed the tanks with an epoxy resin from
Caswell Coatings. While the resin was still drying I cut an aluminum disc
the size of the filler neck and dropped it in the tank. I positioned it
directly below the filler neck and when the epoxy was nearly dry I poured a
bit more over top to cover the disc. Hopefully thiswill protect the tank
bottom from just the damage you describe.

Tim Vader
Kitfox IV
2276 cc Great Plains
Calgary Alberta
---


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Paul A. Franz, P.E.



Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA

PostPosted: Tue Feb 10, 2009 10:27 am    Post subject: Tank repair Reply with quote

On Tue, February 10, 2009 9:44 am, Lynn Matteson wrote:
Quote:


..... and finally
follow up with a new Kreem treatment, if this is what it had before.

Can this be done in a small area? I suspect you have to slosh the whole thing with
Kreem. If that's the case, he may as well have sloshed with solvent (MEK) to begin
with, do the Fiberglas repairs as you suggest then reslosh with Kreem and thinner.

No matter which alternative is chosen for the repair, something has to be done as a
preventative measure to keep this type of damage from recurring. My suggestion is to
fabricate aluminum sleeves that can be inserted into the tank filler that have a
collar on them to prevent them from bottoming out in the tank by resting on the filler
neck. These sleeves should protrude far enough out of the tank such that the typical
fuel filler nozzle can no longer bottom out in the tank causing the damage to occur.

You just carry the slip in sleeves with you. Probably only one is needed if it will
fit the other fill points. The sleeve could be made with a nice tang on it for
connecting the ground wire when filling too.

--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell


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_________________
Paul A. Franz, P.E.
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
425.440.9505 Office
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