Again, thickness does not tell us a lot. Thickness + density would. This is the reason Don's sound deadener showdown literally weighed the rolls of mat. There's also questions about foil thickness, is it actually aluminum, the quality of the adhesives used, the grade of butyl rubber, etc etc. Just popping in to tell us some no-name new company has a new 80-mil product being released tells us almost nothing of value.
And, you find an appropriate name for your company before you start talking to potential customers. Choosing Gorilla Shield for the name, and only later looking up its availability, smacks of amateurs starting their very first business. I think they should try the name "Rhino Liner" next. And they should advertise and print out business cards before they check the national corporate name database.
Im not very impressed so far.