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I put it everywhere. The way I figure - the sealant that's inside the hull opening around the thruhull body is what does most of the work.
I have my own process for replacing thru hulls - I clean the area and the opening, sand them down to gelcoat/clean glass/etc, then cover with a thin layer of clear epoxy as a kind of a barrier coat. Then sand the epoxy layer to create a tooth and then install the thruhull with sealant. I don't know if this actually does anything, but it makes me feel all warm and fuzzy.
Last edited by brak; 04-12-2008 at 08:53 PM.