Holy crap that's ugly!I feel your pain, trying to change dry-rotted tires on my '85 JD Hydro 185 lawn mower with just large C-clamps, MC tire spoon, and pry bars. Apparently slime tire sealant doesn't hold up well when used by turning into a brown mud like gunk.
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I've pulled ATV tires with slime a couple years old, and never saw that. Water getting inside by being filled with an air compressor without a water Seperator?