I started with a double layer, but the diluted latex paint I used as shade paint wouldn't come off, so I had to take the top layer off after the second season. I'm on year five with the layer that is left. It's barely holding together. I had to sew up several splitting seams with fishing line.
6 mil plastic has an r-value of .6 - I think the inflated double layer is like R1.3
If you use an inflation blower, use outside air to inflate, not inside air. Hook a hose to the blower's intake and connect it to a hole to the outside. Inside air has a higher humidity, and is more likely to cause condensation between your two layers.
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