@Ted: Thanks so much. I appreciate the follow up. While this thread does say troweling isn't ideal, it's always suggested that the reason is because of viscosity, which is why I posted my response/questions in the first place. Viscosity is not an issue at the lower temperature I am currently experiencing. The trowel used in the photo posted in the other forum shows that the "bead" left is exactly the same as the 3/8" bead from a caulk applicator. I'm only putting up around 20 sheets of drywall, so was hoping to avoid purchasing an applicator that will only be used once and then never again if I could apply with a trowel. I have since had someone contact me with the applicator they used, and will be purchasing that one. I still think it's worthwhile to explore the possibility of the advantages of a trowel at lower temperatures unless the "compression factor" of Green Glue at a lower temp is absolutely a prohibitive factor (which I could totally understand --and going over this thread again it would appear that "compression factor" is indeed an issue that was explored by you guys in R&D for several months for the new formula).
FYI: The Green Glue was shipped from a company called TrademarkSound. There were no instructions except what is listed on the bucket. This still wouldn't have answered my question though, as in my experience there is always more way to skin a cat, and my specific question involved lower temperatures, which I had not seen addressed in any technical or install literature anywhere else (and as mentioned, I had been pretty thorough with my research).
@Spaceman: I knew who Ted was from other forums and from checking around this forum for answers before posting. None of my specific questions had been answered in the other posts regarding Green Glue, thus I thought it appropriate to pose my questions regarding use of the trowel at a lower viscosity/temp. Thanks for the heads up though, and thanks for the welcome.
@BIGmouthinDC: I did end up purchasing a gun from someone else on this forum who had one lying around after only a day's worth of application (part of what I was trying to avoid). Once this studio is complete, I doubt I'll ever have a use for Green Glue (or the applicator) again. I hadn't seen any contraindications regarding any above freezing temps in the installation literature or testing literature, so it didn't seem like a problem to install the Green Glue at a slightly cooler temperature (which makes using a trowel quite feasible). Ted's suggestion that the compression will be negatively impacted is the first evidence I've seen that it wouldn't be a good idea to install Green Glue at lower temps. I will just bring the temperature of the studio up to "room temperature" for applying and curing the Green Glue (the studio is ridiculously tight, so bringing the temperature up shouldn't be an issue).
Thanks all for your welcomes, suggestions, and help!