Hi, I have just done some myself and I used a double sided tape from Impex it's only about 3mm wide and very clear. I took a length about 2" and placed it along the backbone of the card making sure there was none showing at the front. I then stood the card on it's side with backbone upwards and slipped the acetate wrap over the card worked perfectly (prehaps I was having a good night) I was very pleased with the results.
Hope it helps