I have used the GTU gore shaft successfully
But the moldable drip less makes a nice promise
I wonder what people have experienced
It's been a few years I forget what size diameter we use in our boats
Cliff, you might want to revisit the Stuffing Box articles on the wiki, like this one: http://www.c34.org/wiki/index.php?title=Stuffing_box_packing (http://www.c34.org/wiki/index.php?title=Stuffing_box_packing)
GTU has been replaced by better Ultra X material, and the green goop is so 1980s as to make my boat look new! :D
Cliff : I have used both and much preferred the Gore because it's easier to use.
My thought