This product is very thick, more like paint than ink. Don\'t expect to use it with your pens. You will need a brush or a lot of patients. White No. 2 is very much like White No. 1, except that it costs a little more and that it is not so sensitive to water. Pro: Good consistency for correctional purposes. Very workable. Will not destroy a good brush. Water resistant Con: If you don\'t apply a thick layer the markings below will still be visible. Cannot be used with pen nibs. It is just too thick. It is only water-resistant, not waterproof like the description says.