As seen on TV! The safe, easy way to maintain beautiful tile areas by covering up stubborn stained grout! Grout-Aide Markers dry rapidly and leave a clean uniform grout line without harsh chemicals. Completely odorless and no fumes!Not recommended for shower stalls or areas with a high moisture content.Directions:1. With cap in place, SHAKE MARKER A MINIMUM OF 2 MINUTES.2. Remove cap and depress tip repeatedly on hard surface until paint appears in the tip of the marker.3. If paint flow decreases during use, repeat step two.4. For thinner coverage, dip marker tip in water while applying.5. Replace cap after each use.