---
product_id: 10800429
title: "Grout Pen Dark Grey Tile Grout Paint Marker: Waterproof Tile Grout Paint Pen Colorant, Grout Shine Touch Up & Renew for Cleaner Looking Grout Lines - Dark Grey, Wide 15mm Tip (20mL)"
brand: "rainbow chalk markers limited"
price: "723992₫"
currency: VND
in_stock: true
reviews_count: 13
category: "Rainbow Chalk Markers Limited"
url: https://www.desertcart.vn/products/10800429-grout-pen-dark-grey-tile-grout-paint-marker-waterproof-tile
store_origin: VN
region: Vietnam
---

# Waterproof, long-lasting ink covers up to 100ft Non-toxic, water-based advanced formula 15mm wide tip for smooth, precise coverage Grout Pen Dark Grey Tile Grout Paint Marker: Waterproof Tile Grout Paint Pen Colorant, Grout Shine Touch Up & Renew for Cleaner Looking Grout Lines - Dark Grey, Wide 15mm Tip (20mL)

**Brand:** rainbow chalk markers limited
**Price:** 723992₫
**Availability:** ✅ In Stock

## Summary

> 🖌️ Refresh Your Grout, Refresh Your Space — Don’t Let Dirty Tiles Hold You Back!

## Quick Answers

- **What is this?** Grout Pen Dark Grey Tile Grout Paint Marker: Waterproof Tile Grout Paint Pen Colorant, Grout Shine Touch Up & Renew for Cleaner Looking Grout Lines - Dark Grey, Wide 15mm Tip (20mL) by rainbow chalk markers limited
- **How much does it cost?** 723992₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/10800429-grout-pen-dark-grey-tile-grout-paint-marker-waterproof-tile)

## Best For

- rainbow chalk markers limited enthusiasts

## Why This Product

- Trusted rainbow chalk markers limited brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safe & Eco-Friendly:** Non-toxic, water-based formula ensures a safe refresh for your home environment.
- • **Durable & Waterproof:** Long-lasting ink resists water and wear, perfect for high-moisture areas like bathrooms and kitchens.
- • **Instant Grout Revival:** Transform dingy grout lines into fresh, clean surfaces in minutes without scrubbing.
- • **Effortless Application:** Wide 15mm tip glides smoothly for quick, even coverage on all tile grout surfaces.
- • **Universal Tile Compatibility:** Ideal for unsealed grout on floors, walls, backsplashes, tubs, and patios—renew any tiled space.

## Overview

The Grout Pen Dark Grey Tile Grout Paint Marker features a wide 15mm tip and waterproof, non-toxic ink that covers up to 100 feet of grout lines. Designed for unsealed grout, it offers a quick, easy, and durable solution to renew and brighten grout in kitchens, bathrooms, and other tiled areas, making your surfaces look brand new without the hassle of scrubbing.

## Description

Buy Grout Pen Dark Grey Tile Grout Paint Marker: Waterproof Tile Grout Paint Pen Colorant, Grout Shine Touch Up & Renew - Dark Grey, Wide 15mm Tip (20mL): Industrial & Scientific - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great product! - The grout on my bathroom floor is looking dirty. I purchased this pen and it works great. I also purchased it in other colors to fill in grout in other spaces. Product covers well.
Review: Quick, easy and cheap - Best and cheapest way to totally transform tile. I bought a table at a thrift shop with tile in the center. The grout wouldn’t come clean so I bought this to cover it. Took me a total of 20min to do two coats. It glides on so smooth and effortless. Dries super fast. I recommend having a piece of paper nearby to prime the pen occasionally to make sure it stays wet. Highly recommend this product!

## Features

- LOOK BRAND NEW: Skip scrubbing tiles and use Grout Pen to paint and recolor your grout for a bright clean appearance
- USE ANYWHERE: Ideal for the bathroom, kitchen, and any other room that has floor or ceiling tiles
- LONG LASTING INK: Tackle small or large DIY projects with a pen that covers up to 100 feet of wide grout lines
- ADVANCED FORMULA: Non-toxic, water-based colorant that covers grubby grout stains making it look brand new again
- CAP COLOR: Use the color chart (see images) for most accurate color depiction. Pen cap represents each pen's color but is not expected to be the exact shade, do a small test area first
- SEALED GROUT: Grout Pen may not bond to recently sealed grout. Test the grout with a few drops of water. If the grout does not absorb the water within a few minutes then the grout was likely sealed
- TIP MAY WEAR DOWN: Tip is made of cotton, pressing too hard will damage tip. Contact seller for replacement tips if needed
- SHAKE ONLY WITH CAP ON: Tip is removable and may fall out if shaken hard, only shake pen with cap on (note - Pen does not need to be shaken at all, instead gently pump tip to activate)
- DRY TIP: Pen needs to be primed before use, all new Grout Pens come with a dry white tip. To activate gently pump the tip (20-30 times) until fully saturated

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007D0J0CY |
| Best Sellers Rank | #22,093 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #32 in Tile Grout |
| Brand Name | Rainbow Chalk Markers Limited |
| Color | Dark Gray |
| Compatible Material | Grout (Unsealed) |
| Customer Reviews | 4.3 4.3 out of 5 stars (5,073) |
| Included Components | GROUT PEN |
| Item Dimensions | 1.25 x 1.25 x 6.25 inches |
| Item Form | Grout Paint Pen |
| Item Type Name | Grout Paint Pen |
| Item Weight | 79 Grams |
| Manufacturer | RAINBOW CHALK MARKERS LTD |
| Material Type | Grout Paint Pen |
| Model | GP81216 |
| Number of Items | 1 |
| Part Number | GP81216 |
| Style Name | Modern |
| Supported Standards | ASTM-D4236 |
| Surface Recommendation | Tile , Floor, Tub, Shower, Countertop, Backsplash, Sink, Wall, Patio |
| UPC | 722480212161 |
| Unit Count | 1 Count |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Rainbow Chalk Markers Limited
- **Item Weight:** 79 Grams
- **Item dimensions L x W x H:** 1.25 x 1.25 x 6.25 inches
- **Material:** Grout Paint Pen
- **Style:** Modern

## Images

![Grout Pen Dark Grey Tile Grout Paint Marker: Waterproof Tile Grout Paint Pen Colorant, Grout Shine Touch Up & Renew for Cleaner Looking Grout Lines - Dark Grey, Wide 15mm Tip (20mL) - Image 1](https://m.media-amazon.com/images/I/71F6uMyemxL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Can this be used over painted/sealed grout?**
A: I used on sealed grout and it worked great

**Q: What is the difference in the pen sizes? Does one contain more product or does it have a bigger tip?**
A: The Large Pen is 15mm wide (about the size of a typical Jumbo Marker).  The 5mm pen is about the size of a regular sharpie marker.

**Q: What size room does one pen cover?**
A: Good question.  The manufacturer states "up to 60 meters coverage for narrow grout joints".  60 meters is approximately 196 linear feet, however results vary as the porosity of grouts can very greatly.

**Q: Will this pen let me change the color of grout that is currently white but discolored? I want grey grout lines on my bathroom floor.**
A: Yes

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product!
*by M***S on January 31, 2026*

The grout on my bathroom floor is looking dirty. I purchased this pen and it works great. I also purchased it in other colors to fill in grout in other spaces. Product covers well.

### ⭐⭐⭐⭐⭐ Quick, easy and cheap
*by M***A on March 16, 2026*

Best and cheapest way to totally transform tile. I bought a table at a thrift shop with tile in the center. The grout wouldn’t come clean so I bought this to cover it. Took me a total of 20min to do two coats. It glides on so smooth and effortless. Dries super fast. I recommend having a piece of paper nearby to prime the pen occasionally to make sure it stays wet. Highly recommend this product!

### ⭐⭐⭐⭐ Not for use in wet areas
*by R***N on February 3, 2026*

NOT FOR USE IN SHOWERS This is a great product for floor or wall repair, but given it's water-soluble, it should not be used in wet areas. I used it on my bathroom floor and it worked great. It’s easy to apply. The one thing to be aware of it that you should have a dense sponge (like a “magic eraser”) and once you go over the line, pass over it again with the sponge to even it out. Looks great. I tried it in my shower, however, and it's terrible. It lasts a couple of days, then it starts to flake off. My grout has an interesting color - when it's dry it's almost white (and a perfect match to this gray), but when it gets wet, it turns dark gray (almost black), so, where the product flakes off, you see black portions of the grout coming through. It looks like mold! The treatment seems to last no more than a couple of days. I've tried re-treating it and then sealing it with a clear grout sealer, all to no avail. The product is just not strong enough for shower floor. As I said, the rest of the bathroom seems just fine, it's just the shower floor that seems to suffer. Upside is that it removes pretty easily - I took a nail brush and some alcohol and got most of it up. Now looking for a different solution. Pros: - easy to apply Cons: - Flakes off if used in a shower Recommendation: OK to use in other parts of the bathroom or kitchen, but not where standing water will collect.

## Frequently Bought Together

- Grout Pen Dark Grey Tile Grout Paint Marker: Waterproof Tile Grout Paint Pen Colorant, Grout Shine Touch Up & Renew - Dark Grey, Wide 15mm Tip (20mL)
- Grout Pen Dark Grey Tile Paint Marker: Waterproof Grout Paint, Tile Grout Colorant and Sealer Pen - Narrow 5mm, 2 Pack with Extra Tips (7mL) - Dark Grey
- Grout Pen White Tile Grout Paint Marker Replacement Tips: 5 Pack of Wide Tip 15mm Large - Waterproof Grout Paint Pen, Grout Colorant and Sealer Pen to Renew and Refresh Tile Grout

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-05-18*