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Hello, Andy.
It is recommended that UMAi Dry be kept away from moisture and sunlight. It is recommended that it be used within two years.
As it is a moisture-permeable material, moisture will gradually be absorbed and make the material cloudy and slightly less easy to seal. Sunlight will simply cause it to gradually turn a yellowish color.
The material will continue to be safe and will work, but will become less “seal-able” as time passes.
It is always best, of course, to keep it in a sealed bag away from moisture and light.
Hope that helps.
–Thea