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Having been a model avaition nut for many years, I have to tell you that silk span and tissue are pretty similar. However, silk span is tougher. I have silk span left over from my airplane days and use it regularly as a roofing material. It is porous and allows the paint to penetrate through and bond the silk span to the subroofing layer. It gives a good texture, similar to tar paper or rolled roofing. Airplane modelers using butyrate or nitrate dope on the balsa framework is to seal the framework and bond the silk span to the wood, previously to its' being shrunk with sprayed water. This is not necessary when used as roofing. Simply lay the silk span out on the roof and paint it down. After the paint has thoroughly dried, trim the edges, if needed and your done!
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