Well I didn't use heat in the diffuser, and I don't THINK I used very much adhesive, but I sure am gun-shy about using it again. Thanks for the info about Sullivan's. I will try that next time, IF I don't chicken out of using it any more. It surely did make layering easier....decisions, decisions!
Thanks all for your responses.
I have been using Elmer’s school glue with no problems like this since I heard about it here, and no fumes. I just iron it dry using a press cloth over and under it to protect the ironing board and iron. Bonus, it washes out completely.