- use this pen to paint and recolor your grout for a clean appearance and perfect DIY project - Ideal for the bathroom, kitchen, and any other room that has floor or ceiling tiles. - tackle small or large DIY home projects with a pen that covers up to 150 feet of thin 2mm grout - Non-toxic, water-based colorant that covers grubby grout stains making it look brand new again - do a small test area first LTKSeasonal LTKHome LTKHoliday