I'll just add that I bought the 300 on the recommendations here. thx sf. and it's has worked perfectly. I've used one can of Tytan Extreme Climate. I'm in Canada and I did a lot of foaming this winter. I've got a can of great stuff waiting for when the Tytan empties completely. But let me tell you. I've filled almost 200 feet of joints between sheets of polyiso with one can (and a bunch of gaps in the metal roofing where the bats found their way in). I'll look for the PureFill at Lowes in the states.
I have the cleaner ready for when I change cannisters but haven't used it yet. The current can has been on and in use intermittently for five months. I scrape the tip clean with my thumbnail, shake the can, and away I go.
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