Purchased these dots after reading other good reviews. I only wanted them to use as a fastening on my wedding invites, so they didnt need to be strong. These were so poor that at one point we thought we had a faulty set with one side only! This wasn't the case though, they are just really poor. If they couldn't hold a card flap in place, I can't understand how they would therefore stick anything else together.
First bad review I've had for a product off Amazon and been a customer for many years. I'd have asked for a refund, but cannot be bothered with the inevitable hassle. Avoid.