Replaced water pump that still leaks

1999 Dodge Ram (Sport) 1500 4x4 V-8 92000 miles.

The water pump went out so I had it replaced by a relative that is a mechanic. He made sure that he sealed it as well as tighten all the bults. As far as he knows he didnt miss a step, however antifreeze is still leaking and i'm almost positive it isn't faulty. I've tired stop-leak (only because this truck is my only means of transportation) so far that doesn't seem to stop the leaks either. I'm just wondering if there is a way to fix this with out having to take the water pump back off. Thanks.