Although I store all of my other markers horizontally, my Sukura or gel pens I store vertically, writing tip always down. I find that if I don't , the gel part settles inside the tube wrong. I also do this with my glue pen too. I have gone through 3 packages of the Sakura glitters for I love them so much and found that the first pen I used, stored horizontally, had some problems. Ever since I changed, no problems.
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