No Dacron only Bisonyl.
Cut the Strip of Bisonyl and the two parts of Velcro.
Sew the loops to the Bisonyl.
You can use double sided tape to stick the Bisonyl to the front of the sail. Make sure that the loops will be on the back of the sail if you fold the Bisonyl strip.
Next use double sided tape to stick the hooks to the back of the sail.
Remember to only sew now in the direction of the spine, so you can push the spine in between the Velcro and the Icarex of the sail.
I have not opend the kite Plan right now, but in some of Ulzburger's other Plans you will find a good drawing on how to sew, if it is missing in the Return Plan.