If the airbag is frayed, or has any other visible damage, replace it. Do not attempt to repair an airbag.
When you install the airbag, make sure it is not twisted, and that it is not caught between the inflator bracket by the bracket bolts.
Make sure that the side curtain airbag inflator retainer is installed properly. Otherwise the airbag could incorrectly deploy and cause damage or injuries.
Make sure you have the slack or no cutting and peeling. If tape has slack or cutting, and peeling side curtain airbag should be replacement.
Place the side curtain airbag assembly on the side of the roof. Tighten the side curtain airbag mounting bolts (A) and mounting bolts (B).