Looking at the reviews a few in, they seem to be kinda bad for this product.
The people probably didn't read or follow the instructions very well.
You need to cut each piece of putty in half (easy in the little container) and kneed 1/2 the white, and 1/2 the colored piece together to make 1 plug.
It will cure/harden then. Someone said they had goo in their ear for a long time. Must not have read the instructions and just plopped it plain in their ear.... that would feel creepy...
It is IMPORTANT to clean your hands and ears BEFORE you handle the stuff.
That way, it can't be contaminated, and will set up and cure correctly when it's in your ear. I used Isopropyl Alchohol.
Worked great and really easily for me.
I'm making another set tonight for a back up.
Thought I'd pass it along.