Which is lighter, .6 oz fiberglass cloth, or polyester dress lining, sometimes called Posh ?

Hi Jim--I don't know the answer, but the .6 glass cloth applied with Pacer Laminating Exoxy, squeegied out with an old credit card is a very light finish base, not requiring a lot of primer. I still use silkspan and nitrate dope sometimes on solid surfaces too, such as sheeted wings, etc. Pretty light, and hard.

Hope things are well in the "Old Pueblo" where I went to college in my youth :-)

Clair Sieverling