Eyelash extensions glue. Advice needed asap

[sashslashs]

Hi guys im wondering if someone canhelp me out asap.i have started doing eyelash extensions and im going through stock like its out of fashion at the minute. wheres the best place to get it and which glue is best to use as a few of my clients have really difficult short thin eyelashes and even the thinnest of lashes wont saay on for a great deal of time. i need help asap dont want to lose my customers because the lashes wont stay on.