Hey Ace,
Take a look at Zig 2-way glue. It's great for magic
The stickiness only stays on the gaff card and does not get transferred to other cards, which is good. And its easy to use, ala a highlighter. Remount spray can be a little tricky.
This product was recommended to me by Anthony Owen, interested parties who like the idea of using the principle of the Dark Card, should get Anthony's book, The Sticky Blue Book.
Anyway I digress, the Zig 2-way glue can be found at Bugis Junction, the bookshop beside the "Gift a Name" shop. It's at the level where there is this big NeoPrint shop. (Thanks to MagicDow who pointed it out to me ^_^ )
Added a picture for you if you are interested,

Cheers.
P.S. Remount spray can be found at all Popular bookstores.