Grout Pen Dark Grey Tile Paint Marker: Waterproof Paint, Grout...
USE ON UNSEALED GROUT ONLY: GROUT PEN may not bond to sealed grout. Material: Grout Paint. Compatible Material: Grout (Unsealed). LONG LASTING INK: Tackle small or large DIY projects with a pen that covers up to 150 feet of thin 2mm grout.