2003 ford Taurus water pump. Sealing surface almost corroded away. Will it leak.

What to do when Gasket surface is half gone. This Ford Taurus water pump , Gasket sealing area is corroded and some chunks are missing , Will it seal with half the sealing surface missing. Change coolant regularly would help stop this from happening. This ford tarurus has had a water pump go bad before as this one still looked clean .