Rainbow Chalk Markers Grout Pen Black - Waterproof Tile Grout Colorant & Sealer (2 Pack, 5mm)

Refresh grout without heavy scrubbing

Brighten dull grout lines with the Rainbow Chalk Markers Grout Pen in black. This narrow 5mm pen applies a durable color along tiled joints, delivering a clean, uniform look across kitchens, bathrooms, and other tiled spaces. The product is advertised as waterproof, offering a practical option for humid rooms and high-traffic areas, while keeping expectations grounded in real-world usage.

Key benefits at a glance

• Each pen covers up to about 150 feet of 2mm grout, depending on how you apply.
• Non-toxic, water-based colorant provides a vivid black finish without harsh solvents.
• Cap color serves as a quick shade reference; for best color match, test a small area first.
• Designed for unsealed grout; if your grout is sealed, test a tiny patch to check bonding.

What’s in the package and how to use

• Two pens in a 7 mL size each, with extra tips included for ongoing projects.
• Tip care: the nib starts dry; shake with the cap on and pump to saturate before painting.
• Priming the tip (about 30+ pumps) helps achieve a smooth, steady stroke along grout lines.

Real-world uses and practical tips

Perfect for bathrooms, kitchens, and any room with tile floors or walls. Use it to refresh grout in high-traffic zones or on backsplashes where a cleaner, more cohesive look is desirable. Note that results depend on grout condition and surface porosity.

Guidance for best results

• Test a small area first to gauge color and adhesion, especially on older grout.
• Apply with light, steady strokes; avoid pressing too hard to protect the tip.
• Keep the cap on when not in use and only pump the tip to activate saturation.

While this grout pen can refresh grout appearances, it is not a substitute for structural grout repair when needed. Use as a maintenance upgrade to refresh color and tone between deeper cleanings or professional work.