I’m leaning to the safe side and saying yes. How bad is it and does the water-based seal strategy work at all or that just blog snakeoil?
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Tires with advanced dry rot must be replaced. Dry rot allows air to escape the tire, making it difficult or even impossible to keep the tire properly inflated. Dry rot can also cause unnatural rubber expansion while driving that actually breaks the tire apart. Tires with dry rot are much more likely to develop leaks, holes, and blow outs. Bottom line, get them replaced it's not worth the risk to you and your family.