Hi Mark, we hear you. I think you basically want a watercolor sketchbook. These have thicker pages and can be a little more expensive. I know Chris Legaspi has used the regular gray Strathmore sketchbook for gauche, but the pages tend to buckle. He also used Moleskine Watercolor sketchbook that has thicker pages. Again this is a little more expensive, but your pages will stay flat and wont bleed. I believe Steve had his sketchbooks custom made by Strathmore years ago.
So two things I would recommend:
Do a google search for water color sketchbook, or watercolor toned sketchbook and look for whatever is in your budget
You can also hop on our discord server and chat with us there. We are about to hit 2k members, so come join the party! We have a few students that work in watercolor on there too.
I hope this helps answer your question. 😀
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