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There are a few quick fix in a can that will swell old seals to get them to stop leaking if that is what is leaking in your car.
They don't allways work if you have a gasket leaking I don't think anything in a can is going to solve your problem. You have to use wrenches for that ,and actualy replace the bad gasket.
Quick fixes also usualy fail quickly so you may be back in the same boat in a month or two.
The first thing you should do is clean the area and try to find out what is leaking, sometimes the leak could origanate at the top of the engine and it makes it's way to the bottom by gravity.
Finding the leak is important because it could be something like a valve cover gasket that is easily corrected by changing the gasket or tightening the valve cover bolts.