i used a little on both sides. i did one side and put it on the water pump for a few minutes for it to tack on. then just enough to line around the gasket on the other side.
The Duralast pump I just bought has a gasket on the pump already (which I will remove and put in the Felpro). Do I need sealant pump to plate and plate to block or just plate to block?
Gasket technology has improved a lot over the past 10-15 years. You really don't need any sealer, but if it makes you feel better... If I use anything it's just a dab to hold the gasket in place.
I would use high tack on all sides of the water pump gaskets, its that purple stuff in a metal can that has a brush built into the cap. I only use silicone to make a gasket not too put on a gasket.