Haven’t put wallpaper up yet so can’t comment in this however I would like to comment in your delivery of the product.
My mum took delivery of the paper and the driver handed to her at the doorstep a king cardboard box. She put it down in the house on the carpet and later picked it up to move it and found the bottom of the box to be soaking wet through! She quickly opened the box to check the contents and luckily paper was sealed so no damage apparent although have not opened them yet! I was really concerned to hear that the box arrived so wet and the driver made no mention of this and clearly handed the box to her ins way to conceal the very wet end. Just want to draw your attention to this. Thank you