Is that stuff oily? I find with some tyres if they sit around for a but the sealant reacts with the tyre causing the tyre to release some of its oil content inside and outside the tyre.
Like TM says, I would say it's just stuff leaking through the side wall. It happened on some Bontrager tyres I had, but they still held. If it's still got some air after "a few months " I'd say that's pretty good really...
Is that stuff oily? I find with some tyres if they sit around for a but the sealant reacts with the tyre causing the tyre to release some of its oil content inside and outside the tyre.
It's kinda gross.