To avoid drying out, store slime in an air-tight container (such as the jar it came in). Be sure to keep it out of direct sunlight as this will melt it down faster.

Wash your hands before playing with slime to remove any
excess oils. Remove slime from the jar and place onto a
clean surface. Be sure to wash your hands after playing.

Slime naturally melts down when left untouched for a few days, and will occasionally need a touch up of activator to fix it. To do this, add in a drop or two of
the included activator and knead it into the slime. Be
careful not to add too much at a time. If you over-activate
your slime, you can use lotion to soften it again.