Here's NEMA's take on the use of primer:
http://www.udevices.com/pdf/solvent.pdf Electrical PVC cement comes in 3 flavors; Regular, Medium, and Heavy Bodied.
The Heavy Bodied cement is recommended for larger pipe sizes, it has a longer cure time (hence more time to fit the conduit), and easier fills the voids between the socket and the conduit.
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I've tried all kinds of primer/glue combinations with Carflex, always with unsatisfactory results. The glue just doesn't stick to the Carflex.
I guess that's why the make the cheap plastic fittings.
