Started to colour the draft horse from yesterday. You can leave the Graphitants dry, but I prefer them after water is used on them. You can go over them again after they are dry, but its sometimes hit or miss how well it works depending on your paper. This is a 140lb paper so should be ok and survive most abuse I throw at it. 300lb would be better but I don't have any of that weight that is hot pressed. And smoother papers I find work better with these pencils.