They work very well and I am very pleased with their ease of use. As far as I know it's a washable adhesive and works flawlessly for me and they are very similar to the Sakura Gelly Roll Pens. I don't recommend opening them all at once (remove the little plastic tip to allow the glue to flow) because if you don't cap the cap well enough it will dry out and use up the entire pen. it will stop flowing, try scribbling on a piece of paper. If all else fails, remove the cap and gently tap it against your palm until it begins to flow again (if I have to, I'll hit as hard as possible without breaking it to get the glue to the tip). If none of this works, stick with cotton, flip down. Repeat the previous steps in order and this will most likely work if the glue isn't dry or the ink is out.
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