I was told that the Briggs sealant would not rust steel rims. That they put stuff in them to prevent that. And looking at
this website, it says Slime is doing the same thing.
I've used both. But only on customers tires. I can't remember one ever coming back.
Looking on Amazon, I found this stuff.
Phantom Farm Ballast and Tire Sealant. The reviews say it's extreme good stuff. But hard to put in a valve stem because it's sooo thick. I asked how much would it take to fix dry rot cracks on a riding mower, this morning. But haven't gotten a reply yet.
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