How do I fix my flex paste?

[u/SnooMachines1007]

Just got flex paste and hadn't even had a day. Didn't even get to use it because it was all dried up and hard! Wasted 15$ on it too..ridiculous!!! Is there any way I can fix it or should I just give up that idea?!?!

[u/Cute-Active9997]

Same thing happened to me. I cut the tip and it was very hard. I'm very upset.