Yes, wrapping it with saran is good, but for more than a day or two you need to place the tube in the refer and keep it cold. This will allow opened tubes to last for a month or more. At least in my experience  Just remember to take it out an hour or two before you need it so it can get soft again.
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Brett G
WBCCI #5501 AIR # 49
"Stop worrying about the potholes in the road and celebrate the journey." -- Fitzhugh Mullan
Wise men talk because they have someting to say; fools, because they have to say something. -- Plato
In politics, absurdity is not a handicap— Napoleon
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