Rick was doing a 170. I made my own, but it took almost 2 gallons for my 200. You don’t want to run out half way through blueing the deck down.
I think that when using bonding putty you put enough down that, when squished down, it covers the whole surface you are bonding to. With epoxy, I squeezed out a 1" "S" and hoped that it might cover the tops but didn't care if it didn't, epoxy is strong. I guess it's a Ford Chevy thing. The cost is about the same with epoxy and chopped glass (1 gal kit vs 2 gals of bonding putty) but which is stronger....