to seal or not to seal marine eyes?

[allene]

I feel compelled to give a generic answer, as I do not have experience with the fittings in question. My generic answer is that you cannot seal anything sufficient to keep water out. To do so would require a hermetic seal and they are very difficult to make. You can seal it to keep water from getting in faster than it can get out. But if you have a little cup that has no drain in the bottom, you will just be sealing the water in. I guess that puts me one of the two categories.