is there any chemical which stop the leaking when you put pools water?

Marlig makes "Fix-a-Leak", Leisure Time makes "Stop Leak"
There is "Tub of Gold" but I can't remember who makes that.

Good Luck

Chemical fixes have there place but you can't beat finding the leak and fixing it correctly.
I know of an installation company in the uk that when they are nearing the end of a project clean out the local supplier of leak fix products to dose the pool water with. What quality pool builders there are out there, musn't complain though as we fix lots of there pools!