My last batch 99% of the interfaced pieces went perfectly - but there were a few pieces that I had to do the interfacing again on. The second time I ironed the interfacing all went well - but I didn't wash until the next day. I am wondering because I some of the pieces I did wash the same day that I ironed on the interfacing... so I wondered if those were the few that were done that morning and caused them not to "stick" ... or maybe those were just difficult. It is a mute point now anyway... I have running to do and won't be able to wash anything any more today. Thanks for all of your thoughts