When you draw very detailed illustrations on your journal, you end up using so much ink that the paper becomes soggy and turns wrinkly. To make sure this doesn’t happen, you could use watercolour paper,
The Zebra Sarasa Mark On’s main feature is that the ink is specially-formulated so that it doesn’t smudge when the marker is used with a highlighter. I tested this feature and it really works. There was no smudging at all with any of the highlighters I tried it with.