I would not use fasteners from Home Depot until you check out the origins. www.McMastercarr.com has all the stainless hardware you need as they seem to supply the US Navy contractors.
Teak is awesome and not expensive and will make the boat look much better.
Not sure Locktite red will be the solution for the screws in fiberglass, would look at the 3M Marine sealants/adhesives. Don't get me wrong locktite is great but too thin and the 3M (I want to say it is a 3000 number or something like that I used it a couple of years ago and it was awesome) would do a better job in fiberglass.