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You can do it in 2 parts if you want. Start wit the bit you want to sit on, use about 1/3 of each tin. then put anoter bag down your back and pour a bit more then you used for hte first bit. If its too cold it wont expand very much. A good tip is to pour each tin into the bag and mix it with your hand by sqishing it around in the bag. Try heating up the tins a bit with a heat gun. But be careful if its too hot it will go MAD and end up all over your shoulders and the car!
Good luck!!
Matt
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