#1 is "Fast Drying, Hard Setting".
#2 is "Non-Hardening, Pliable Sealant".
#1 and #2 come in squeeze-tubes.
#3 (Aviation) is "Slow-drying, non-hardening brush-top sealant"; so more like #2 than #1, but thin enough to flow instead of being thick like toothpaste. Why this is special for "Aviation" is totally beyond me.
Don't think so or it would be labeled as Permatex #1
Gotcha thanks. I use #1 a lot, I’ve seen #2 I just thought “aviation” might have been a broad use generic name. Thanks for clarifying. I’ll see if I can find some.