@kdfrawg The surface and sizing of the paper has quite a big effect on how the paint behaves. It can be quite frustrating to change paper and suddenly have things not doing what you expect. I haven’t found that to be a problem in switching between major brands, but if you try to do watercolour on sketchbook paper, it can be very different. It works the other way too — people who are used to working on sketchbook paper don’t always like using “proper” watercolour paper.