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.
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