Slime is very sensitive to temperature and will always change over time. Summer months can be a tough time for slime as it melts from the heat and humidity. Luckily..under activated slime can always be brought back to its original state by adding activator like this!
Things that can make your slime get sticky;
- Being stored by a window
- Being left near a heater
- Being kept in a hot car
- Overplaying (hands generating heat)
- Dry skin on hands
- Slow hand movements when playing 
This spray is a borax based slime activator that will reactivate slime from a sticky or melting state. 
Everybody’s skin is different and slime can tend to stick to dryer skin. 
Spraying hands before play can also help if you have skin that tends to stick to slime.
*This is not advised for those with sensitive skin or any skin conditions.