Advice with condensation curtains?

I could see if you really want to use it as a makeshift bivy, but nanoseeum looks to be the same weight as M50 and would work as a condensation curtain too.

condensation curtain @ Nemo tents

I was looking at the condensation curtains available on the Nemo mountaineering tents and I would like to try to make one work for my Hilleberg Jannu. Nanoseeum would work as well as Momentum? Is that the consensus?

I was thinking of trying one for our Nallo. I would have thought the less permeable the better. There will always be leakage around the bottom anyway but the damp breath air will rise and wants to be directed out not allowed in.

The Nemo condensation curtain seems to have stitched a continuous velcro strip flat onto the tent wall and the other part on the removable curtain The problem with this is the velcro is in peel. It might be better to stitch one edge only of a light tape to the wall, so it is permanently in the plane of the curtain. Then just have regular velcro tabs to attach the curtain to the tape. Less velcro but in shear.