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Thread: Use of Filler on Fuselage

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    Default Use of Filler on Fuselage

    There are several places on the fuselage where the interaction of components require the use of some kind of filler to create a solid foundation for fabric covering. Front left AL panel and carbon fiber intersection adjacent to fuel selector/Rear Fuel Drain area/Longeron and Alloy Tubing both sides of rear fuselage to name a few.
    CC use Bondi in the videos, but Polyfiber advise "No" because of shrinkage and later possible de-lamination of the fiber.
    Some suggest the application of anti-chafe tape in susceptible areas to cover the filler before covering will work.
    Others say an epoxy filler? is the only answer.
    What works?

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    Senior Member c130jake's Avatar
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    Default Re: Use of Filler on Fuselage

    I used poly fibers two part epoxy filler. Light weight and designed to be used with their process.

    https://www.stits.com/store/superfil.html

    Jake


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    Jake
    Finished CCEX N96FV!

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    Senior Member David H's Avatar
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    Default Re: Use of Filler on Fuselage

    Russell,

    This is what I used. worked perfectly:

    DSC_0808.jpg

    See post 34 on this excellent thread:

    http://forum.cubcrafters.com/showthr...n-s-Build-Tips

    David

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    Default Re: Use of Filler on Fuselage

    Thanks for the reply, I used a very similar West System 105 resin product.

    www.westsystem.com/the-105-system/

    Very happy with the results, did you apply fabric tape or paint before the fabric blanket?
    Cheers,

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    Member jmorrical's Avatar
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    Default Re: Use of Filler on Fuselage

    I am finishing last things before I start to cover my fuselage. The EX cover manual says I should use light weight filler putty where needed. I have done the fabric spacer/top stringer left side and the tail fin transition. One other place mentioned is at the end of all stringers.

    When I look left and right sides where the two stringers are glued to the aft end of the fuselage and lay a straight edge across both top and bottom longeron to simulate fabric stretched over that area I don't see any need to fill any of those joints. Those joints fall inside the fabric line. My test shows the fabric beginning to contact the stringers very gradual forward of those joints. Fabric wouldn't meet the stringers fully until 2-3 inches forward of the joint. Am I missing something here?
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    Last edited by jmorrical; 11-02-2019 at 10:05 PM.
    Jim Morrical

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    Default Re: Use of Filler on Fuselage

    No, not missing anything, I think you are fortunate that this is not an issue for you.
    Quote Originally Posted by jmorrical View Post
    I am finishing last things before I start to cover my fuselage. The EX cover manual says I should use light weight filler putty where needed. I have done the fabric spacer/top stringer left side and the tail fin transition. One other place mentioned is at the end of all stringers.

    When I look left and right sides where the two stringers are glued to the aft end of the fuselage and lay a straight edge across both top and bottom longeron to simulate fabric stretched over that area I don't see any need to fill any of those joints. Those joints fall inside the fabric line. My test shows the fabric beginning to contact the stringers very gradual forward of those joints. Fabric wouldn't meet the stringers fully until 2-3 inches forward of the joint. Am I missing something here?

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    Member jmorrical's Avatar
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    Default Re: Use of Filler on Fuselage

    Just curious. My EX Cover Manual says: Spray Etch Primer (RM 30005-11) on all of the places filler was applied. Let the primer dry, then spray the area with black paint.

    Why is the primer needed on the filler?

    I can understand priming then painting scuffed steal frame tubing would inhibit rust, but what is the purpose for primer and paint on filler if we're covering the area?
    Jim Morrical

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    Default Re: Use of Filler on Fuselage

    Hi Jim,
    My original post was around complying with the Covel Manual or the Polyfiber Manual where they differ, to accomplish the same outcome. I am outside the USA and some products referenced in the CC or Polyfiber manuals are simply not available, so an equivalent must be applied.
    To address your question, the use of black paint was simply to comply with the manual, I would guess that the filler requires a sealer, before applying Polytak, the real reason- I do not know.
    Quote Originally Posted by jmorrical View Post
    Just curious. My EX Cover Manual says: Spray Etch Primer (RM 30005-11) on all of the places filler was applied. Let the primer dry, then spray the area with black paint.

    Why is the primer needed on the filler?

    I can understand priming then painting scuffed steal frame tubing would inhibit rust, but what is the purpose for primer and paint on filler if we're covering the area?

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