I am really having a hard time these days with iron on *Vilene. I sew a huge amount and I just cannot remember if one uses steam with the iron or not. I have tried both ways and both a disaster. This morning I have rummaged through my bag of Vilene and found a black piece which is years old. I am making a dark shirt so black will be fine. I did the collar with the steam on and the cuffs with the steam off. Both have worked beautifully. I have come to the conclusion that the Vilene we buy here in S. Africa is absolute rubbish these days.
**I know Vilene is the trade name and I am sure that is not what we get here.
I use a Teflon sheet or a piece of old cotton between the Vilene and the iron to prevent sticky accidents. And sometimes some old sheeting on the ironing board to protect it too.
Look for the dots on the Vilene, that is the glue and that goes against whatever you are ironing it to.
Humidity can affect the results.
Good Luck.