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Thread: primers for steel tube-- compatable with polyfiber

  1. #11

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    Default Re: primers for steel tube-- compatable with polyfiber

    I am confused.

    The Poly Fiber STC states “Remove original cloth covering and install Poly-Fiber covering material in accordance with Procedure Manual NO.1, How to Cover An Aircraft Using the Poly-Fiber System, dated July 2001, or later FAA approved revision.”

    So, you have to follow the manual.

    The Poly-Fiber manual states “If you’re re-covering a certified aircraft, you must follow the basic steps in this manual without any deviations or substitutions.”

    OK, no substitutes.

    The P-F manual [airframe prep] also states “Use only two-part epoxy primers …”, and the manual specifically calls out to prime steel tube structures with PF EP-420, using EP-430 Catalyst, and thin per directions with E-500 Reducer.

    So how can you use other epoxy primers or powder coat and be in compliance with the Poly-Fiber STC?


    [I’m not trying to argue this, I’m just trying to get a clarification. Thanks]

  2. #12

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    Default Re: primers for steel tube-- compatable with polyfiber

    Yes I think you are correct that the STC must be followed--- however the two statements seem a little contradictory-- "use only 2 part epoxy primers" and then "ep-420"...
    I prob should get the manual before I purchase any epoxy primers. (maybe call them too)

    T

  3. #13

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    Default Re: primers for steel tube-- compatable with polyfiber

    Steve and gilbert-----
    OK-- that's what I wanted to know--- so even though its epoxy primer --- there must be a certain level of porosity even after cure. So maybe long term some moisture could get through to the steel and make rust...…
    So that means I should plan to topcoat the primer within an appropriate short time after priming.

    That's what I needed to know.

  4. #14
    Administrator Steve Pierce's Avatar
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    Default Re: primers for steel tube-- compatable with polyfiber

    Quote Originally Posted by Roger That View Post
    I am confused.

    The Poly Fiber STC states “Remove original cloth covering and install Poly-Fiber covering material in accordance with Procedure Manual NO.1, How to Cover An Aircraft Using the Poly-Fiber System, dated July 2001, or later FAA approved revision.”

    So, you have to follow the manual.

    The Poly-Fiber manual states “If you’re re-covering a certified aircraft, you must follow the basic steps in this manual without any deviations or substitutions.”

    OK, no substitutes.

    The P-F manual [airframe prep] also states “Use only two-part epoxy primers …”, and the manual specifically calls out to prime steel tube structures with PF EP-420, using EP-430 Catalyst, and thin per directions with E-500 Reducer.

    So how can you use other epoxy primers or powder coat and be in compliance with the Poly-Fiber STC?


    [I’m not trying to argue this, I’m just trying to get a clarification. Thanks]
    They way I read the manual and the discussions I have had with Polyfiber is the manual calls out how wide your glue joint is, legal mechanical attachment to the structure etc but there is a lot of guidance not regulation.

  5. #15
    Gilbert Pierce's Avatar
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    Default Re: primers for steel tube-- compatable with polyfiber

    Polyfiber has changed the manual many times. To make the change legally binding they have to change the STC which they have not done. The FAA person responsible for the fabric STC told Steve and I this at OSH a number of years ago. I have a collection of early PolyFiber manuals. I pick the one that suits my needs and reference it.

  6. #16

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    Default Re: primers for steel tube-- compatable with polyfiber

    Quote Originally Posted by Gilbert Pierce View Post
    Polyfiber has changed the manual many times. To make the change legally binding they have to change the STC which they have not done. The FAA person responsible for the fabric STC told Steve and I this at OSH a number of years ago. I have a collection of early PolyFiber manuals. I pick the one that suits my needs and reference it.
    I can work with thatthumbs-up-emoji 2.jpg

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