Ruling Pen for Masking Fluid, Cross Hinged Ruling Pen for Cartography, Calligraphy, Fine Line Drawing, Suitable for Use with Masking Fluid, Drawing Ink, Indian Ink and Gouache

I had heard about this item a long time ago and was excited to see it available. It is excellent for applying thin lines of masking fluid. Goes on easily and smoothly. You can easily adjust the opening for different thicknesses. Highly recommend.

I used this both with masking fluid to mask some light reflections on cold-press watercolor paper that needed to be regular lines. Just dipped it in bottle, keeping masking fluid well below hinge piece and the screw wheel. Practiced a second to get the angle right for a nice line on a scrap piece. Once you get the angle, it flows smoothly, and the weight is nice and feels balanced in your hand. Lines are clean and smooth, and the tool holds way more fluid than I had expected. No trouble with drips, and the wheel is great for adjusting the width of line as well as for clean up. For clean up, I used just a barely damp paper towel (damp from wiping my brush after painting and dip rinsing in clear water), and you couldn't even tell it had been used. Tried it out with some watercolor paint from a palette well to smooth a line in places, and it worked like a dream. Again, just dipped, gently and quickly stroked outside once against clean edge of palette well. No drips, no need to put in with a brush, at least for me. Clean up still fast and easy no residue. Excellent product.

Very nice quality. Definitely above the $10 variety. Excellent for ink or masking fluid.

High quality, well-made ruling pen. Excellent for using with liquid frisket to preserve whites in watercolor paintings.

I didn’t understand how this would work better than a small paint brush for masking, but I decided to try it because it was highly recommended by a colorist on YouTube. Well, it does work better. It holds quite a lot of fluid so you don’t have to replenish frequently. It cleans up way better than a brush. All in all, I’m really glad I purchased this handy little tool.