A Man to man question

Wet the pieces.
Slap them one on top of another. Press and hold together.
Let it dry.

It’s the time it requires a life transformation from soap pieces to hand wash solution.

I did not get your question. Why would one stick them? I just throw the small pieces of soaps😒

make it wet and slap

Seriously I stopped using soap bars. Get liquid soap instead.

I usually slap them together after the new soap is used once and while it's still wet. And just for the very next usage be careful for them to not come apart. There after the old and new soap becomes homogeneous.

I use shower gel