sealing metal to metal surfaces in the seawater cooling system???

There's a million different brand names Mike, i suppose if you wanted to pick one you could be sure of, you wouldn't go wrong with Loctite.
 
I just bought what they had in my local car accessories shop. Fairly sure it was called Rapid Gasket but RTV silicone isn't going to vary much whoever made it. The car parts stuff is black coloured, no idea why, in contrast to the bathroom clear versions.
 
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