How much is a 600SF 2-part spray foam kit? Can these tanks be lowered into a 5 gallon bucket of hot water? When I needed to empty a 20lb propane tank I used the hottest water I could get out of the sink filled into a 5 gallon bucket and set the propane tank on top(since its too big to fit inside). You could use a 5 gallon bucket to get the final bit of foam out. If the last 1/4 or so was in there and if the cans can fit in 5 gallon buckets, boil some water ahead of time and when the cans start getting to cold to flow then drop the tanks in the buckets and keep going. I do the same thing when charging A/C systems, the can gets too cold for there to be pressure for the stuff to come out but dunk it in hot water and out it comes. Keep in mind you'll be putting it in boiling water but the tanks will probably be next to frozen by then so the temperature will equalize to something reasonable fast and you won't have to waste the foam.
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