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Old Oct 24, 2012, 10:31 PM
AIR SALLY is offline
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deltas are cool
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Tehachapi ,CA.
Joined Apr 2006
22,455 Posts
i use armalon and a layer of perferated tedlar,then a paper towel ,plus a beather cloth. for ducts they can be done with out a bag.the shape of these ducts needs pretty heavy cloth or a lot of C/F tow and glued to some bulkheads ,there is a lot of suction with a long duct and the oval shape want to collasp.
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