Hi Green,
It may be, but this stuff is really dense and tacky. Foam filled, I'm guessing would create a "run-flat" tire, isn't terribly heavy, and wouldn't be near as dense and sticky, would it?
I'm trying to think of something that would be similar to provide at least a little bit to compare it to. The stickiness is something like some really old grease. You know, the stuff that you get on your finger and no matter how much you try to flick it, it just doesn't want to come off on its own. I'd say it is a lot more dense than old grease. As for color...sort of a dark brown but not quite black.
As a ballast, I think this stuff is the cat's a$$, that is if it also serves as a run-flat. Part of what I'd like to find out, aside from what it is, would be where can I get more of it for my new front wheels and tires. I just put rear wheel spacers on last night, and trying to get the tires reinstalled was a pain...suckers are heavy!
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