This session was just cleaning the aluminum surfaces of the parts I had previously scuffed parts with isopropyl alcohol. This just removes the stray debris and oils that had accumulated during my prep work.
I've also been rewatching the 2.5 hour-long YouTube video by Scott McDaniels of Van's Aircraft about fuel tank sealing so that these processes are fresh on my mine when I start doing them in the next couple of days. Reviewing some of Jason Ellis' fuel tank videos has also provided some more tips, though his techniques were not influenced by having seen Scott McDaniels' video.