Good idea with the drywall knife, a bit of a painters palet. I hadn't thought of that, and yes exotherm is the main issue I've had with the piping bag next to the mess. And the time filling it is a bit of a pain also. Six-10 is costly, but I've actually been able to re-use the tip a time or two. I cobbled up an adapter for my air compressor nozzle, blown out the goo and stored it in a sealed jar of de-natured alcohol. Blow it out before re-use and squeeze a bit out to insure a good mix and back at caulking the seams. It's the price of the applicators that get you, I'm cheap that way. Actually my Dad thought of it. Don't tell West, they will change it, probably add some sort of a check valve or other contraption!
Thanks for the replys PAR, Tehani.
Any other thoughts....