"Courtney Thomas" wrote...
What is the difference in the following paints for the optimal barrier
coating for a fiberglass hull:

1-one part epoxy
2-two part epoxy
3-LPU
4-somethin' else

What would be the most effective sequence for barrier coating for a boat
that has had nothing done beyond Awlgripping [over 5 yrs ago] ?

You probably want something purpose-made as a barrier coat, like the 2-part
Interlux Interprotect 2000E (or follow-on). As for applying over Awlgrip,
follow instructions on the can of whatever you decide on. It will probably
require sanding and a prep wash at a minimum.