1999 Acura Integra water pump

I am not a fan of using any stop leak addictive. The problem with these products are that they are designed in such a way that they can end up clogging your heater core and radiator which use very thin fins/ galleries to transfer coolant. I would recommend you replace that water pump and possibily the timing belt if its contaminated with coolant.

The stop-leak will not work.