Depending on where you live, your slime may arrive sticky due to the warm weather, or cold + stiff due to the cold weather. You can find fixes for these problems below.

How to make borax activator:
1. Add 1 tsp of the provided borax to 1 cup of warm water.
2. Mix the solution until it dissolves.  
3. Add the solution in tiny amounts.
4. Knead your slime until it is not sticky.