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Building Tips and technical articles. => Paint and finishing => Topic started by: Bootlegger on May 20, 2011, 08:08:23 AM
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:! Has anybody used Poly Span over a balsa sheeted foam wing? How did it work, and would you do it again?
Also what method did you use it to apply it, did you have wrinkles, how did you remove them and what method did you use to finish it?
Thanks a lot, Gil y1
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Put it on like a built up wing. Dope around the perimeter for a enough dope on the wood to get a sheen to it. Light sanding to get wood smooth. Lay Poly-span on surface and smooth it out as much as you can. Then dope down the perimeter to attach. Then the hot air gun to get rid of wrinkles and to tighten it. Then start doping as you would a built up wing. Remember Poly-span is a synthetic material that replaces silk-span. H^^
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Thanks Doc, I appreciate the advise..
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Make sure the shiny side is up. mw~
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And the greasy side down? LL~ LL~ LL~
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On a sheeted wing I use silkspan, easier to get it flat and smooth vs Polyspan, and you don't need the extra puncture resistance of the Poly.
Thats the main advantage of Poly over Silkspan on open bays..
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I agree with Allan.....no need to use polyspan on sheeted wings, use only on open bays....better to cover your sheeted wing with carbon fiber, then your deisired finish.
Geno
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Carbon fiber is so expensive and in my experienceis no stronger than silkspan or Poly-span. That is if you use dope to put it down. Now with Epoxy it is a different story. H^^
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Carbon fiber is so expensive and in my experienceis no stronger than silkspan or Poly-span. That is if you use dope to put it down. Now with Epoxy it is a different story. H^^
I have to disagree.
I have used both silkspan and cf with dope, and the cf gives you a harder shell on the surface of the substrate which I feel is more resistant to dings and dents caused by hangar rash.
I also noticed that cf (again with just dope) gives you more torsional rigidity when used on flaps..