Forgive me if I am last century, but I have just used a new-to-me glue pen - the Sakura Quickie Glue Pen which I bought from Handy Hippo for £2.95. It gives such a fine line that you can't believe anything will stick, but I sprinkled fine Rio glitter over and Wow, a teeny thin line well adhered!! I have a million ideas for it and Christmas cards are underway!!!!