There are a lot of different brands of this. There are permanent ones that you'll never get appart, and ones that fall apart if you blow on them. I've found that almost all of the ones sold at the large box stores are junk, at least for my applications. I've had the best luck with some industrial carpet tapes, but at $16 a roll and case minimums, I have a hard time justifying it. Spectape is my favorite. I look for the cloth tapes that are thicker.
Most of the time I've been using it has been for plastic fabrication, so in those cases I needed the patterns or templates to stick really well because they tend to vibrate loose on the router table. Perhaps I'm too hard on the stuff sold at the box stores, but they seem to lose their tack really quickly if there's any dust in the vacinity.