PolySpan
Hi does anyone have used Randolh butyrate over Polyspan .
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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.
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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.
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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 |
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 |
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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