but maybe your layers are *too thick* and you need long prong snaps? If the prong is not getting flattened into a nice flat disc (look in the middle of your snap) then you either need to press harder or get a longer prong.
One word of caution, though, on pressing harder...
If you press too hard you will crack the snap. In fact, pressing really, really hard is one way to remove a misplaced snap!
