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Thread: PolySpan


  1. #1

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    PolySpan

    Hi does anyone have used Randolh butyrate over Polyspan .

  2. #2
    dgliderguy's Avatar
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    RE: PolySpan

    I have found it is best to do a coat or two of nitrate dope first, then follow it with butyrate, for better adhesion to the fibers.
    Glider junkies creed: No glider, no lift, no reason to live.

  3. #3
    vertical grimmace's Avatar
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    RE: PolySpan

    Randolphs is not much different than sig's and I have heard Brodak's dope is Randolph's. Randolphs works very well.
    \"let\'\'\'\'s just say, they will be satisfied with less\" Ming the Merciless

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    RE: PolySpan

    I don't think the issue is the brand, it is butyrate vs. nitrate. Nitrate has a reputation for giving better adhesion. I used doped Polyspan on one plane and liked it very much. I'm pretty sure I used nitrate for the first two coats. It sounds like the post above comes from experience, but I would be interested in hearing how butyrate worked, or didn't, as a base coat. Sig says butyrate is fine directly on Koverall, so I'd expect it to be OK on Polyspan too, but I haven't tried it.

    Jim

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    RE: PolySpan

    Butyrate was all I knew after we started using alkahol fuels.
    I covered many planes with silk , nylon , and silkspan using
    nothing but butyrate. Being poor and living close to a small
    town airport a sympathetic group saw to it that we had all
    the dope we needed. They were not considered pushers in
    those days. Planes were heavy but fun.
    Ralph

  6. #6

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    RE: PolySpan

    I've used Polyspan with Randolph Butyrate dope and almost all my competition Free Flight planes including 1/2A planes and 96" Lanzo Bombers, A SAM type old timer plane.
    No problem at all and it's a fantastic covering product. I use a foam brush available in Walmart for brushing it on.
    Larry Davidson


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