If you have a puncture that is in the area of the tire that has foam over it, the sealant can't reach the puncture to seal it. Even Slime says so:Also, I would not use your sealant liquid on a tire with foam because I would be concerned about it affecting the TPMS , but how do you know it won't work through the foam?
Can Slime tire sealant be used in quiet tires? | Slime FAQs
We do not recommend installing Slime sealant into quiet tires. The tread area of a quiet tire is coated with a layer of foam. If the sealant is installed, it will be instantly absorbed into the foam, rendering it unable to reach and treat the puncture.
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