Slime is good for punctures as ref my earlier post in this thread.
However.... at the weekend I found I couldn't inflate my slimed tyre - nor could I deflate it: the tyre valve had jammed. Via an assortment of valve removal tool, tweezers and pins I eventually managed to pull it out but it was stuck in thickly congealed slime from that pumped in back in August 2015. It took boiling water and wire brush to release the valve from all the gunk.
I've never had this happen previously - has anyone else? Or could it have frozen (despite my bike being stored in a uPVC utility room, albeit unheated)? I'm just glad I discovered it while at home rather than following a puncture only to find I couldn't reinflate the tyre.
As for the repaired puncture, I could see where the puncture occured on the inner tube and there was a welt of green fibres across it holding it secure - very impressed by this. Less so by the congealed valve.