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Your local tire shop will love you. Now they can add foam to fix-a-flat as things they hate seeing in tires they are changing. That aside, I think any foam you try will permanently flatten with use and any, such as a dense foam rubber, that are stiff enough to hold their shape for a period of time are going to add a lot of weight to the tire. The advantage of air is that, as long as the psi is maintained, it will always return to its original shape when released.
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