That really depends on where I want them to go. For my nails, I use clear nail polish (usually a top coat) and they stay on for several days, but eventually fall off. For my face I use eyelash glue. If I wanted to put them on false eyelashes before I apply them I might use a stronger hold glue, let that dry for several hours to a day and then apply the eyelashes with regular eyelash glue. I have oil skin in some places, so I've generally tried to avoid the self adhesive.