I'm really not that keen on ironing. plus, I don't have an iron.
I wish that the film was 100% flat since I'm scanning a crap load of 35mm negatives now and they look SOOO good.
Hell, no !
With "ironing" I meant the squeezing of the film between two flat surfaces and wait a bit.
I thought I had made that clear.
You could just take a bunch of negatives and store them between some big heavy books for some time.
I came to that idea, because I had problems with Newton rings on the glass mount, since I mounted dry,
and when I removed the film (tried with both: 35 mm and 120 MF film) it was very flat, at least for some time before curling up again.