John asked me to look into Rhino Linings Epoxy. http://www.rhinolinings.com/divisions/epoxy
I seem to remember that Jeff from Jeffco Epoxy works for them now. I was given his email and phone number, but he never responded. I also seem to recall that he had actually gotten a USCG approval for a fire retarding epoxy,  without additives. I seem to remember also that the Jeffco Epoxy had a variable hardner ratio. Maybe someone here knows more about these.
I do not see a stretch to failure percentage on their online data sheet. The HDT is very high so I suspect the product is brittle. I have applied for more data and a sample. Maybe I will learn more.