"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

PolySpan

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Old 06-18-2012, 11:25 AM
  #1
1/2 jorgen
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Default PolySpan

Hi does anyone have used Randolh butyrate over Polyspan .
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Old 06-18-2012, 11:31 AM
  #2
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Default 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.
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Old 06-18-2012, 12:06 PM
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Default RE: PolySpan

Randolphs is not much different than sig's and I have heard Brodak's dope is Randolph's. Randolphs works very well.
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Old 06-18-2012, 02:02 PM
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Default 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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Old 06-18-2012, 09:21 PM
  #5
mylamo
 
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Default 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
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Old 07-20-2012, 11:48 AM
  #6
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Default 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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