I was introduced last fall to a new type of product - I think it was called Enviro-Bond. I've used polymeric sand with some success, and was the first in my market to be using it. But this new stuff was organic.
This Enviro stuff was a little bit different. Where the idea of polymeric is that once wetted it locks up tight as a drum, this organic stuff stayed somewhat flexible, so it could move if the pavers moved. If the paver's heaved a bit in winter, once this stuff was re-wetted it'd settle back into the joint and harden up again. It'd happen every time it rained.
I saw some test photos of shower sprays pouring on the stuff on a vertical surface and it didn't look like it was washing away, so it seemed promising.
The only thing I wonder about is the breakdown. If it's organic, it's going to break down. I wonder how long it takes, and if there's any smell associated with the break down.
Anybody have any experience with this?
This discussion has been included in the site beginner's brick paving page.
You can also read a detailed article about polymeric sand.