RE: [RCSE] Microballoons mixture.

[Scobie Puchtler or Sarah Felstiner]

My understanding is that your two goals  are incompatible.  In professional
composite construction, microballoon filler is not generally relied upon to
add any strength. It is used because it thickens the epoxy well and if
enough is used it can be quite light, and it sands fairly easily compared to
other fillers. If you want anything like reasonable sandability, you won't
be getting strength out of your filler, so plan to  let your existing glass
sleeve provide the strength, and make the filler as light (max balloon, min
epoxy) as possible. As long as it's not acting strong, it might as well act
LIGHT, and more balloons = less drip. If your existing sleeve work isn't
strong enough, then a composites person might suggest adding another layer
of glass, this time finer lighter weave. It will begin to fill the bigger
irregularities, it will add strength, and less non-structural filler will be
required after it goes on.

Any of this make sense?

Lift,
Scobie in Seattle


 -Original Message-
 From: Kjell-Arne Fjelde [mailto:[EMAIL PROTECTED]]
 Sent: Wednesday, April 05, 2000 3:53 AM
 To: [EMAIL PROTECTED]
 Subject: [RCSE] Microballoons mixture.


 This is most probably a silly question. But I´ve never used the
 stuff before
 so :)
 Im vondering how much MB to use (in volume) so I´ll wont compromise the
 strenght of the epoxy too much, while still be fairly easy to sand. I´ve
 repeaired a fuse and used a glass sleeve to fix it. And the next
 step is to
 fill up the roughness of the glass sleeve. Sand it smooth and put some
 gelcoat on it.

 Any thoughts how this mix is supposed to look so I´ll get the
 best strenght
 and still be easy to sand.?

 Btw I´m using 16h epoxy so the mixture must not drip away from me either.

 regards
 Kjelli
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Re: [RCSE] Microballoons mixture.

[George Voss]

Epoxy carries no RELATIVE strength in the repair.  Mix  the balloons to a Ketsup 
consistancy and fill the weave with that.  Feather
it past the repair about 1" (25.4mm).  gv

Kjell-Arne Fjelde wrote:

 This is most probably a silly question. But I´ve never used the stuff before
 so :)
 Im vondering how much MB to use (in volume) so I´ll wont compromise the
 strenght of the epoxy too much, while still be fairly easy to sand. I´ve
 repeaired a fuse and used a glass sleeve to fix it. And the next step is to
 fill up the roughness of the glass sleeve. Sand it smooth and put some
 gelcoat on it.

 Any thoughts how this mix is supposed to look so I´ll get the best strenght
 and still be easy to sand.?

 Btw I´m using 16h epoxy so the mixture must not drip away from me either.

 regards
 Kjelli
 __
 Get Your Private, Free Email at http://www.hotmail.com

 RCSE-List facilities provided by Model Airplane News.  Send "subscribe" and 
"unsubscribe" requests to [EMAIL PROTECTED]


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Re: [RCSE] Microballoons mixture.

[Lenny970]

In a message dated 4/5/00 4:56:51 AM Mountain Daylight Time, 
[EMAIL PROTECTED] writes:

 I´ve 
 repeaired a fuse and used a glass sleeve to fix it. And the next step is to 
 fill up the roughness of the glass sleeve. Sand it smooth and put some 
 gelcoat on it. 

It sounds like the epoxy and glass is your structural repair and now 
you're concerned with the cosmetic finish.I've had good results by just using 
the epoxy alone.  If you cover the wet epoxy with some plastic food wrap  
while it cures the finish will be very smooth.  
Hmmm, I never tried this, but I wonder if painting the plastic wrap first 
would transfer the paint to the fuse just like a bagged wing??

Lenny Keer
RMSA, Colorado
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