The pen works great with watercolor pencils. I have yet to figure out how to REFILL it. If anyone can help me with that I'd be very grateful. Contact me at; email@example.com
I bought one of these and I cannot get the cap off to put in fluid even with pliers, which they do say to use to twist it off. I resorted to putting the entire pen, tip down, into the blending medium refill bottle. Works but not ideal...