Re: Nautolex vinyl on a new fiberglass deck.
I tried Nautolex in my fiberglass trihull. It was nice and grippy and looked good and was easy to hose down, but I found three major problems with it:
1) Cut very easily (as in, drop something on it and it cuts)
2) Very difficult to get it to conform to anything that has a curve
3) Water got under it and never dried out completely
If I was doing a perfectly flat aluminum boat deck and could wrap and staple all edges, that would tend to make issue #2 (and probably thus #3) moot. And, in that situation, if I could put some sort of thin underlayment first to absorb shock, and some sort of wear trim (like aluminum angle) on hatch cover edges and such, that might help with issues #1 and #3.
(I did use leftover Nautolex to wrap wooden bulkheads and hatch covers on the trihull, all with wrap-and-staple and some landau foam underlayment, that's all turned out really nice.)
But on a fiberglass deck? I would not lay sheet vinyl again.
(For the record, I ultimately went with Interdeck 1-part polyurethane non-skid paint and could not be happier with the cost vs appearance / performance / ease of application / ease of care / ease to touch up.)
Ask respondents to this thread whether they did a tinny or a fiberglass; I bet 9 out of 10 who like Nautolex (or any sheet vinyl) did a tinny, and used wrap-and-staple (and perhaps underlayment) that you won't be able to do.