Replace fabric with glass

Question for the Razorback Fabric guy:

I'm currently finishing up the training for my A&P certificate at the
school here in Anchorage, and as it so happened, the lecture this
morning was about fabric covering. The instructor brought up Razorback
fabric, mentioned that it is great stuff, but then added that we don't
see much of it here in Alaska because it tends to sag in cold weather
compared to the shrunk-on polyester fabrics. As I recall from the
lecture, he said it was due more to contraction of the underlying
airframe in sub freezing temperatures, than any change in the fabric.
The heat shrunk fabrics apparently don't suffer as much from this
because there is enough extra tautness is added during the shrinking
process to make up for any dimensional change in the airframe at low
temperatures.

I was just wondering if you have any comments in this regard?

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Del Rawlins-
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