I know lots of folks have had troubles with paint blobbing with these paint markers. Up until the last few days, I haven’t…until now. That being said…and will discuss at length in a min. I love the way the paint flows and the colors. Just curious…why isnt there a black, white or grey??? I was hoping by being gentle with them, dipping the nibs in water to start the flow, that I had bypassed the issue. What was the change? Not sure to be honest. It could have been that they sat too long in a horizontal position…but what I think more likely, in my case, a 4 hour flight to Colorado or the act of going from sea level(NC) to the Mile High City did it.So what’s an artist to do??Problem solve!!I noticed that many had air bubbles. So I briefly removed each nib to allow air escape and made sure they have been stored vertically with nib up. So far, it seems to have done the trick.I tested all of them and had problems when I depressed the nib. Or shook up the pen. So to be safe, store upright, and when using allow gravity and water osmosis to start the flow. I may go back and take the nibs out and break bubbles some that have to see if it goes better.