Can this be used over painted/sealed grout?

I used on sealed grout and it worked great

What is the difference in the pen sizes? Does one contain more product or does it have a bigger tip?

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.

What size room does one pen cover?

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.

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Grout Pen Dark Grey Tile Grout Paint Marker: Waterproof Tile Grout Paint Pen Colorant, Grout Shine Touch Up & Renew - Dark Grey, Narrow 5mm Tip (7mL)

Grout Pen Dark Grey Tile Grout Paint Marker: Waterproof Tile Grout Paint Pen Colorant, Grout Shine Touch Up & Renew - Dark Grey, Narrow 5mm Tip (7mL)

Product ID: 10800428

Details

Brand
Rainbow Chalk
Item Weight
25 Grams
Item dimensions L x W x H
0.7 x 0.7 x
Material
Grout Paint
Style
Modern

💧Waterproof & quick-dry

🖊️5mm precision tip

🛠️Covers up to 150ft grout

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€ 17.08

Duties & taxes included

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

✨ Refresh Your Tiles, Reclaim Your Space 🏡

PRECISION 5 MM TIP - Narrow tip for flawless, professional-grade application every time.
ECO FRIENDLY SAFE - Non-toxic, ASTM-D4236 certified formula keeps your home and family safe.
EFFORTLESS GROUT RENEWAL - Transform tired grout in minutes without scrubbing or mess.
WATERPROOF LONG LASTING - Advanced water-based formula resists stains and moisture for durable results.
VERSATILE SURFACE COMPATIBILITY - Perfect for bathroom, kitchen, floors, walls, and more—tile surfaces everywhere.

The Grout Pen Dark Grey is a 7mL waterproof grout paint marker featuring a narrow 5mm cotton tip designed for precise application. Its advanced, non-toxic water-based formula covers up to 150 feet of 2mm grout lines, instantly renewing and brightening tile grout in kitchens, bathrooms, and beyond. Ideal for DIYers seeking a quick, mess-free grout makeover with professional results.

Specifications

ASIN	B0077LMF9Y
Best Sellers Rank	#20,803 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #26 in Tile Grout
Brand Name	Rainbow Chalk Markers Limited
Color	Dark Grey
Compatible Material	Ceramic
Customer Reviews	4.2 4.2 out of 5 stars (5,090)
Included Components	Grout Pen
Item Dimensions	0.7 x 0.7 x 5.5 inches
Item Form	Grout Paint Pen
Item Type Name	Grout Paint Pen
Item Weight	25 Grams
Manufacturer	Rainbow Chalk Markers Ltd
Material Type	Grout Paint
Model	GP81116
Number of Items	1
Part Number	GP81116
Style Name	Modern
Supported Standards	ASTM-D4236
Surface Recommendation	Tile , Floor, Tub, Shower, Countertop, Backsplash, Sink, Wall, Patio
UPC	722480211164 072248021116
Unit Count	1 Count
Warranty Description	100% satisfaction guaranteed
Water Resistance Level	Waterproof

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