Mine leaked after I R&R last winter.
Just new gaskets, no sealant.
Leaking seemed to stop as the summer wore on and we used the boat.
I thought about R&R again to add some Permatex or something, but since the gaskets set I didn't bother.
Next time I R&R for whatever reason, I will add some black sealant to both sides.
1991 ProStar / 351W with 1:1 Velvet Drive