*headdesk* No-Fray substitute? Help?

[winterknight.livejournal.com]

I forgot, AGAIN, to pick up no-fray liquid. I'm trying to put a magnetic purse snap into fabric (wool blend and taffeta) backed by ironed-on interfacing. This is my third trip to the fabric store in which I've forgotten it. I have... resin glue, nailpolish, PVA, modpodge... I could stitch around the slits I need to make...

I just don't have any chance of getting back out to that store for days. :(