Vince Lupo
Whatever
If you really want to attempt to do a temporary patch, try using a black fabric marker. They are normally used to decorate t-shirts, and you can pick them up at arts supply stores for about $3.00. It will fill in the holes and sink into the fabric somewhat, and it is also flexible so it won't crack. I filled an entire 6x6 shutter curtain from a Reflex Korelle, and it worked great.