Uni Posca PC-3M Paint Marker - Fine Point - 15 Color Set

I do an in-depth review of these, compared to the Montana acrylic markers on my blog - http://www.acuriouskat.com/2012/09/montana-acrylic-markers-review.html

I've used these pens to illustrate on surfboards, wood, and heavy bristol. For these applications, I love working with them. While the paint is water-based and can seem thin in certain colors (particularly the white), they are capable of very nice layering effects and offer up nice color. If you visit the Posca (UK I think) website, they have a downloadable material list using a 5 point rating scale to gauge performance on many different materials such as metal, wood and glass. Easily the best water-based paint markers I've used.

True the ink of this Posca pen is a little thin. but it allows for layering. Since I know how this pen acts I love it. the attributes allow for some very cool techniques that can't be accomplished with other paint pens I've used. Also it doesnt smell and allows you to layer without pulling up the line you just layed down. if you are looking for a white pen try this. If you are expecting white paint try a tube and a brush.

I purchased the POSCA in an attempt to find my holy grail- a white brush pen. Unfortunately, the POSCA has a lot of issues that prevent it from being such. 1. The ink is watery, and will reactivate non-water-safe ink if applied on top (very important if you're a comic artist, and are using the white brushpen to make corrections) 2. The ink isn't fully opaque, so even if it does not reactivate the ink beneath it, there will be some ghosting 3. The pen is pressurized, and may leak during barometric pressure shifts (or in an airplane cabin). Unfortunately, I do not reccommend this product.