Mine leaked after initial install pulled back apart found I didn't have the bolts on wingplates sealed enough, so I put it on both side with finger I used black 4200 retightened. Resealed inspection covers with RTV Silicone as well as rubber seal Imco supplies then more RTV on back and front side of screw holes as well as the screws themselves.

I used a new transom assembly seal when reinstalling my assembly put RTV on that as well for added security.