Does curtain blackout lining need to be hemmed?

[SallyOMalley]

Can anyone help me? We've had a pair of curtains shortened for a new window. The blackout lining is now too long (obviously ... Didn't think of that at the time!)

I think we got the linings from dunelm - they're a slightly plasticised cotton on one side and the other has a brushed feel to it. They attach by hooks to the tape at the top of the curtains.

If I carefully cut them, do I need hem them? Will they fray? Or ... Will wundaweb work? I don't have a sewing machine. Ta!

No you won’t need to hem them as blackout lining won’t fray, just lay them flat, pencil a line across the lining which should be at least 1” above curtain fabric and cut, done!

Thank you! That's the news I wanted to hear.

Literally just cut mine as above. They are still working fine a year later.