Tom,
It's the same stuff but from Seal-Pak in Wichita. The nice thing about their's is they have their 'A' style which is consistency of honey, the 'B' is the normal, consistency of peanut butter.
Never used the flame master brand, but I'm sure someone will chin in if it's supposed to be grey or black. Mixed 10:1 by weight, right?
Best,
Jim