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@aggi
I have some inner tubes with slime pre-filled.
Not had a puncture in them yet but I don't know whether it's down to the inner tubes or the Marathon tyres.
I do find that if I haven't pumped them up for a while then I need to use pliers to undo the valve as the green stuff has gunked it up. It occasionally squirts green stuff out as you attach/pull off the pump too.