Make sure the chicks have something like paper towels to walk on. They can get splayed legs on slippery surface.
Happy your hatch worked out..Everytime you hatch learn a little more. :)
Off the top of my head I used Bacitracin a petrolium jelly ointment. You want to be care full of what you use. Water will just evaporate.
I take a more hands off approach, some chicks as mentioned can take 24 hours to pip there way out.
My experience and my opinion. I have saved some chicks by...
If the egg shell is part off a good chance there is a hole in membrane. I take the hands off approach. It is hard not help and watch. I came to this conclusion from my own experience.