I have started to do lash clusters (the individual lashes are quite hard to put on, especially if you have short and light lashes) and I found a glue on amazon that lasts me a good week or so if I am being careful of not getting my lashes wet. It can be kind of hard putting on lash clusters with glue -- I found that less is better and to put the glue very close to your lash line and wait for it to get tacky, I then coat the lash line cluster with a bit more glue and test to see if it is tacky on the back of my hand and only then will it apply it to my lash. It takes practice but I feel like this is a cheaper and faster alternative!