Sharpie Oil-Based Paint Marker Pen - Extra Fine Point - Blue

I’ll second most of the previous reviewer’s comments, adding one additional remark. This pen works well if the writing surface is nonporous.
I purchased the pen in order to mark-up color aerial imagery printed from a variety of color printers/photocopiers (non-inkjet). The toner of the prints is sufficiently slick that white rollerball pens work poorly. I had hoped that the prints would be sufficiently nonporous for this pen (the toner polymer coats the surface of the prints completely). Unfortunately not – when using regular copier paper the ink absorbs quickly, disappearing almost entirely. This effect can be avoided by printing to transparency films or to glossy photo paper (the pen works well on both, but neither are options for this project). I found the pen to work poorly on non-glossy photo paper.
On nonporous surfaces, the line laid down by this pen is of reasonable opacity and uniformity after drying (drying quickly – after 5 seconds or so). Certainly good enough for the mark-up purpose I had in mind, although perhaps less than ideal for art projects (where perfect opacity and uniformity might be desired). For these reasons, I’ll give it four stars – reiterating that the rating only applies to nonporous writing surfaces.

I'd purchased one of these elsewhere in my quest for a good white pen (or marker) that dries opaque or at least somewhere close...

This one didn't fit the bill at all. I'd heard some good thing about paint markers from a fiend, and really was hoping that I would hit the jackpot and get nice, opaque coverage. Not only was it nowhere near opaque, but it was barely visible once it quickly sunk into the paper.

Reluctant to accept how bad it was, I tried it on a good number of different kinds of paper -- dark, light, thick, thin, various textures (even cerealbox interior cardboard, just in case that would have worked), and over different kinds of stuff -- various markers, graphite, and colouring pencils... and it didn't do any good over any of those. I tried applying more of the fluid, less of it, double and triple-coating it. In the end, the only thing that it worked halfway okay on (and not really all that good) was when I applied it to a glossed surface, like the outside of a cereal box kind of finish.

I can't stress enough just how overwhelmingly disappointed I was with this product, or how utterly useless it is to me. I may be able to use it on some paper I don't yet own someday, or on some glossy paper, but otherwise, I can't imagine ever finishing it off. And honestly, if someone reading this has a suggestion of what I coud be doing wrong and/or of what type of paper might work better, then by all means, I'd love to hear it. Until then, if I could have given this product zero stars, I would have.

Otherwise, I'll say that I MUCH preferred the "Sakura Gelly Roll Regular Gel Ink Pen - 0.4 mm - White" which you can find here on JetPens. or a white Galaxy Marker from American Crafts. While neither of those is perfect (thus why I tried out the white "Sharpie Oil-Based Paint Marker Pen" in the fist place, they work world better for me.