Where exactly is the pump leaking? From behind where it is bolted to the block?
From above where it mates wih the head? From behind where the heater return pipe is pushed into that outlet on the pump?
Did you polish the mating surface on the block before installing the replacement pump?
Did you, using a small mirror, check for and clean/polish the matting surface on the head; where that "mushroom" seal at the top of the pump meets the head?
FYI, using sealant on the WP gasket opens you up to the following risk: Some of that sealant gets squeezed out to the edges and may drop off and get circulated around and end up in the radiator blocking the channels. (ask me how I know this!)
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