I read a lot peoples' angry comments about the pvc turning cloudy in just a few years. It's meant to let light into barns and sheds more than it is for greenhouses. The polycarb is actually meant for greenhouses.
Even the polycarb will need to be replaced at some point. I would use a temporary shade paint like Kool Ray on it in the summers, and I think it would last longer that way. The paint can be pressure-washed off in the fall.
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