While sometimes I think it's mostly a way to support the pros, these warnings do have some merit... The mixing and timing of use is important, and there are specific temp and humidity requirements that, if ignored, can produce a less-than-perfect result.
However we've painted a couple of boats with Awlgrip, nobody would mistake it for a professional job, but while far from perfect it looked pretty good from afar!
I'd go for it.. if your prep is good, do the best you can wrt conditions. I think the durability of a 2 part for decks might be worth it.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)