Review on ZEYAR Oil-Based Paint Markers, Expert Of Rock Painting, Extra Fine Point, 48 Colors, AP Certified. Permanent Ink & Waterproof, Works On Rock, Wood, Glass, Metal, Ceramic And More (48 Colors) by Danielle Rodriguez

I don't care very much for these. It is really difficult to shake them enough to keep the paint base and pigment combined. You can think that you have shook them enough, and they still will end up having paint come out in the beginning that is separated, dark and off-color. It takes a lot of playing around with them just to get them to flow for a moment, and then they stop flowing, and you have to start over again. You have to have a separate piece of paper or cardboard to use to dabbed the ink and keep the ink flowing, or your project will become a mess. And because the ink doesn't flow very quickly out of them without you constantly pressing the hard, somewhat retractable tip to let down more paint, you are basically getting flow, no flow, flow, no flow, the entire time. If I had known this, I never would have purchased them. And if you try to drag the pen along and make a straight line, you will end up with splatter, because the tip is so hard that pulling it along the surface of your medium causes a vibration, which makes the paint slightly splatter and fly off the tip. There seems to be a really difficult and long that learning curve with getting what you really want out of these pend. If you simply want to fill and spaces or paint a rock, and not really do anything too technical or exact with them, they might be better for that. I just don't know if they will run out of paint before I get my moneys worth, since half the paint ends up on my dabbing/prep surface, used to keep it flowing without getting leaks on my project in the process. It's a great idea, but poorly designed.