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  #1  
Old 06-18-2014, 11:13 AM
rightrudder rightrudder is offline
 
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Default SuperFil on bare aluminum?

I've nearly completed the empennage on my 9A, and I've purchased some SuperFil epoxy filler to address some dings in the skin. If I apply it now, will it be affected by the etching process before primer? Or do I etch, prime, and then apply the SuperFil? I plan on scuffing the repair areas thoroughly with sandpaper.
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  #2  
Old 06-23-2014, 11:04 AM
rightrudder rightrudder is offline
 
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Anyone? I know it's a pretty basic question, but I just don't want to do it if an etching process affects the filler during paint prep. My thought was to sand the dings, apply SuperFil, sand down smooth, and then use maroon Scotchbrite pads to scuff the entire surface to be painted/primed.
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  #3  
Old 06-23-2014, 01:44 PM
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Greg Arehart Greg Arehart is offline
 
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Hey, Doug, you might be the only one to ever get a ding in the aluminum, so maybe nobody knows the answer to this.

Not based on any personal experience, but I would think your plan should work, provided the superfil sticks to the aluminum.

Cheers,
Greg
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  #4  
Old 06-23-2014, 02:09 PM
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I would etch prime then fill.
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  #5  
Old 06-23-2014, 02:23 PM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by ColoRv View Post
I would etch prime then fill.
Or use an alodine conversion coating first like the manufacturer recommends -

http://www.polyfiber.com/products/su...epoxyfiler.htm
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  #6  
Old 06-25-2014, 10:29 AM
rightrudder rightrudder is offline
 
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Thanks for the replies/insight, guys.

Greg--yes, I believe I'm the first.
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  #7  
Old 06-25-2014, 11:56 AM
Bartman Bartman is offline
 
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Default E 2300

"E2300 is no longer manufactured by polyfiber.""substitute alodine 1201" "Polyfiber makes no guarantee as to how suitable this replacement is"
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  #8  
Old 06-25-2014, 12:46 PM
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Quote:
Originally Posted by Bartman View Post
"E2300 is no longer manufactured by polyfiber.""substitute alodine 1201" "Polyfiber makes no guarantee as to how suitable this replacement is"
Both products are (were) made to Mil C-81706 - there should be no problems with the substitution.
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  #9  
Old 06-25-2014, 02:30 PM
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JonJay JonJay is offline
 
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I used SW Wash Primer to prep the metal. It's holding up well.
I filled nothing over 1/16" of an inch, maybe 1/8" on my fiberglass parts. It is sparingly used on my airframe. I would rather see a dent than have filler start popping off under the paint down the line.
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  #10  
Old 06-25-2014, 09:56 PM
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I used Superfill on a few dents on my airplane after scuffing with scotch brite. No issues after a thousand hours or so. The stuff works well as a light body filler.
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