The bottle states that the ink is waterproof after it is dried. I haven’t tried using watercolor over it yet, but I’ve been using it with Zebra’s Sarasa Fineliners. I let it dry about 5 – 15 minutes, depending on how thick I’ve used it, and so far the fabric tips have not clogged.
Jetpens has some great information on both white inks and white ink pens.
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