I think "neoprene thread" is a sign of memory failure. Someone confused "the same thread they sew neoprene with" (which could be plain polyester or nylon) with "neoprene thread" and there's no thread, AFAIK, that is made of neoprene.
An issue in the sailing, tentmaking, canvas
industries is that if your thread is not matched to your fabric
, the thread can actually saw through the fabric
and cut it apart. There's no easy repair for that. But if you choose a weaker thread, when it fails you can literally sew through the same old holes--right on the dotted line--to replace failed thread. Traditionally the best choice was "dacot" dacron thread with a polyester wrapping, two materials in thread. The dacron core
provided strength, the polyester wrapping softened the chafing and cutting against the fabric.
The new (10-15 years?) GoreTex stuff is supposed to have similar benefits, being very durable but not sawing up the fabric.
Proper tension on the thread also is going to affect that, another reason that a loft or shop using cheap
or may not provide the same results, even if they are using the same materials and the end product looks the same to the eye.