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01-18-2018, 08:20 PM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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Fillers
I have a couple of small dents in my project that are driving me nuts to look at and I?m looking for recommendations on fillers. While I intend to paint, something close to aluminum color would be preferable.
Thanks
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01-18-2018, 10:07 PM
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Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 407
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I'm no expert, but I'm thinking epoxy and micro?
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01-19-2018, 06:13 AM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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Flexible
I'm afraid epoxy and micro would not be flexible enough.
Anyone have experience with SuperFil?

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01-19-2018, 06:15 AM
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Join Date: May 2010
Location: Fleming Island, FL
Posts: 162
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I haven?t yet tried it
But SuperFil was recommended to me by previous RV builders. They used it in their planes (now flying).
__________________
Con Kelley
RV7
Empennage and wings need tips
Fuselage kit "finished" (for the moment)
Finish kit and FWF in progress
Hartzell CS
Aerosport Power IO-360, Dual Pmags, AFP FM200 FI
Hangar construction at 7FL4 nearly finished.
Home construction at 7FL4 about to begin.
C-172 at KCRG (sold)
C-150 at 7FL4 (sold)
www.mykitlog.com/cakelley
www.1379.eaachapter.org
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01-19-2018, 06:16 AM
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Join Date: Aug 2015
Location: Leesburg, VA
Posts: 492
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Superfil is basically pre mixed epoxy and micro balloons. Great stuff but not flexible as it cures very hard.
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01-19-2018, 06:21 AM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Another approach to the problem...
I just notice a couple of small dings on the top surface of my right wing. I considering these or something similar as at least a temporary fix...
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Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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01-19-2018, 07:12 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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The fundamental choice is epoxy resin base or polyester resin base. Given a suitably prepared surface (freshly sanded and cleaned), either will stick to aluminum. The epoxy out-sticks the polyester. Either is flexible enough, if not applied too thick.
The solids added to the resin base can be microballoons (glass or phenolic, i.e white or reddish brown), talc, ground plastic, wood flour, and/or a whole bunch of other stuff. Pre-mixed products generally claim some special recipe (such is commerce), but consulting the MSDS will offer a clue as to what is really in them.
Microballoons and talc are the most common. Micro (hollow spheres) adds bulk with little weight. Talc is heavier for a given volume, but sands smoother.
I tell you all this because a builder can easily mix whatever he likes.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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01-19-2018, 08:11 AM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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Funny
Quote:
Originally Posted by longranger
I just notice a couple of small dings on the top surface of my right wing. I considering these or something similar as at least a temporary fix...
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Thanks for the chuckle Miles.
Thanks everyone for your inputs.
Yes, I know very well the properties of thickened epoxy mixtures, and I could easily mix-up something of my own (I don't think I'd consider the saw dust approach however  ). I was hoping there was something out there I didn't know about that might be a bit more flexible. Maybe it's just not an issue.
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01-19-2018, 09:01 AM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
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How about just metal glaze, something like this Evercoat 425 Metal Glaze ultera,
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
They sand easy and smooth with little pinholes and paint will adhere to it very well.
__________________
Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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01-19-2018, 09:42 AM
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Join Date: Nov 2006
Location: Bennington, Vermont USA
Posts: 1,301
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How big are the dents?
It amazing how minor defects disappear as the build gets bigger. If the dents are small I'd leave them alone. Filler adds weight, attracts the eye and will eventually crack and flake off.
I struggle to find the dings that bugged me during the build and no one else even notices them. I'd leave the metal alone unless it's really bad.
I did pin-hole fill the fiberglass before paint.
Just my 2 cents.
Jim Sharkey
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