I have been using clear nail polish and it is holding up even put through the washer and dryer.
Here is one that I swear by - see if this is available locally or online.
Elizabeth, I see you have your answer. Basically school glue/paste will work. Just thin it out and apply it with a straight pin/needle. I use a pin because it is the smallest end of anything I have in my sewing room.
I've used Elmers glue. It dries clear and works well. Just put a very little amount on the fabric.