Christine, Bo Nash Powder is used for mending tears, holes, burn holes in fabrics of most all sorts. Someone on another list mentioned it to me so I went online to check it out. Believe me, once you iron over the powder, its just about impossible to remove the patch. I was going to try to stuff the patch inside the hole as I wasn't happy with the results but I couldn't get it off so I just trimmed around the edges and I'll wait till it wears or frays off to attempt again. The stuff does work though. Another name I found is 007 BoNash Powder. There's a video out there to see some of their examples how they do certain types of fabrics.
Thanks for looking at my quilt.
Suz in Iowa