I had this when I irst opened my bottle. Happened only a few times, and was on the tip, was as if it had set, so I could actually pick it off. Was when I was setting gems and using it lots for careful work if you know what I mean.
iv not had this happen in weeks now though...this thread just reminded me of it!
Weird. Not sure what the deal is. Never used nr sunlight or LED lighting. .stumped!!