Does the tire have to be completely flat before I use Fix-a-Flat?

Please make sure that your tire is as flat as possible before attempting to install Fix-a-Flat. If there is air in your tire, it will push the sealant out, rather than allow the sealant to inject into your tire and seal the puncture. You can use items such as a key, a pen or the back of a tire gauge to let the air out of your tire.

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