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Marvel inflatable tin foil balloons can serve as an excellent background for photos Inflate the balloons on the day of the event. Aluminum foil balloons can last for several days if they are filled and stored properly. Due to the weather, the balloons used outdoors float for a much shorter time. An aluminum foil balloon requires a low-pressure adjustable aluminum foil inflator to inflate. These regulators have an automatic pressure valve to close and will not expand excessively. Balloons can usually supply helium at your local party supplies store, flower shop or even some larger grocery chains. For larger balloons or a large number of balloons, renting helium tanks from party rental companies or local welding suppliers may be more cost-effective.