Mr Grasshopper
OzCardTrader
It was on my school books, and cardborad like the one Select provide to be stuck on, It may last longer in a penny sleeve folder but I know that after 30 years this glue dried up, it may last up to 60 years in a penny sleeve folder but the glue won't last for ever.may be different if your cards are placed in a penny sleeve and folder not a school bag,