Just Rite Rapid Mark Ink is used for the following types of rubber stamps: Just Rite Metal Self-inking stamps (plains, daters, numbering stamps), plastic self-inkers and traditional handle stamps. It is a solvent based ink, which will dry on non-porous surfaces in 45 seconds and will stay moist in a pad for up to 1 week. No activator is required and it is very easy to re-ink.