I did all the bonding with Hysol U-09FL. This included the ridgeline and all 8 reinforcement patches. I was a bit worried at first since after several hours it was still movable, but after 24 hours the bond was stronger than I could pull. I simply overlapped the ridgeline by 1" and glued in between. Not sure if a full 1" over lap was needed, but the end result was real solid.
I was a bit skeptical of people saying Cuben is much easier to work with than silnylon. But once I got the bonding thing down I have to agree. Being able to see through it, cut with a simple exacto knife and the fact that it folds and holds the fold makes it real nice to use. It was far easier to hem the tarp edge than a silnylon tarp is to hem.