Not sure what kind of glue he's using, but wow--talk about taking your time... Perhaps he's priming the frame and using one of those contact cements...
Honestly, if you're not doing a load of frames, you'll want to find someone you could buy some from--the bottles I get are 16 ounces and do about a hundred 20x24 frames. The bad part is, they have a shelf life--they get thicker and thicker as they sit, and soon are no longer suitable for finer meshes. If you use them only occasionally for a number of years, eventually they will barely run out of the container.
There's a pretty hefty learning curve to doing the whole stretch and glue thing properly, plan on screwing more than a couple up before you get some decent ones. And ventilation, and safety gear are highly recommended--FOLLOW THE DIRECTIONS.