Adhesive caulk has a unique consistency. I remember touching it as a child and being fascinated by how rubbery it was.
I didn't touch it while it was wet, because I didn't want to get any bad chemicals on my hands. However, a day or so after it had been applied, I would put my finger on it and press down. It felt almost like a dry snail, because it felt springy.
You would think that something like this would be weak and not a good choice for sealing gaps. However, it was incredibly strong, even though it wasn't hard.