Kaleb, I assumed that you meant Hysol. I've used Loctite Hysol U09-LV and U09-FL for cuben/cuben bonding, cuben/fabric bonding, fabric/fabric bonding, and hard plastic/fabric bonding. If you have some hysol, I'd recommend that you test the flexibility by bonding a small scrap of Dyneema X to a small scrap of cuben. You'll have a rigid little wafer when it cures.
You may be able to sew through it if you have a herculean sewing machine, but fabric/fabric and fabric/cuben hysol seams break the needles and challenge the motor on my sewing machine. It worked once for me, when I bonded TiGoat's 0.7 oz/yard, 8 denier nylon to cuben and clamped it as tightly as possible to force out most of the glue.
This adhesive is only flexible when the layer is very thin.