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It’s really hard to get the ink started and consistent. I’m using it to draw over watercolour and it just does not run smoothly because the struggle to get the ink flowing. Excess paint dries on the tip making it useless. I usually love this brand, but in this case, I’m very disappointed. Waste of money for me.
The few that do work give a clear strong white impression and look effective against black labels. They're easy to use but don't leave the lid off. Tap them a few times on a surface, nib end, to encourage white ink to release and flow to nib.
I tried these on printed certificates with a dark area for my signature and found they dry out very quickly and even when they do appear to work, they don't allow for a complete signature without skipping or fail to flow.
After you've pressed, too much paint flows to the nib. It is then worthless to have a fine nib because the stroke will be fat anyway. Also since the paint is not very pigmented, the paint gets transparent and you need to shake every few strokes while drawing to keep it white. How can you be spontaneous drawing?
For those that read ‘tire’ in the description or saw a review saying it worked well on their tires, I had quite the opposite experience. First, even after shaking rigorously, and pressing down on the tip as instructed, I could not get an even flow on the paint. Secondly, the paint that did come out almost appeared to ‘repell’ against the rubber surface, beading up rather than spreading uniformly. It’s very streaky now and looks like a hack job. Now I’m going to have to find some real white tire marker paint to fix it. I DO NOT RECOMMEND FOR TIRES!!!