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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Description

✨ Revive Your Tiles, Elevate Your Space! ✨

EASY TO USE - No mess, no fuss—just apply and watch your surfaces shine!
ECO FRIENDLY FORMULA - Safe for your home and the planet, because we care!
LONG LASTING RESULTS - Designed to withstand wear and tear, keeping your tiles looking fresh.
TRANSFORM YOUR SPACE - Revitalize dull grout lines with a splash of color!
PRECISION APPLICATION - Fine tip for detailed work, ensuring a flawless finish.

The Rainbow Chalk Markers Limited Grout Pen in Large Dark Grey is the ultimate solution for restoring and enhancing the appearance of tile grout lines. This durable sealant features a precision tip for easy application, ensuring vibrant and long-lasting results. Perfect for DIY enthusiasts and professionals alike, it combines ease of use with an eco-friendly formula, making it a must-have for any home improvement project.

Specifications

Material	Grout Paint Pen
Brand	Rainbow Chalk Markers Limited
Style	Modern
Item Weight	79 Grams
Item dimensions L x W x H	1.25 x 1.25 x 6.25 inches
Compatible Material	Grout (Unsealed)
Water Resistance Level	Waterproof
Item Form	Grout Paint Pen
Supported Standards	ASTM-D4236
UPC	722480212161
Unit Count	1 Count
Number of Items	1
Color	Dark Gray
Surface Recommendation	Tile , Floor, Tub, Shower, Countertop, Backsplash, Sink, Wall, Patio
Manufacturer	RAINBOW CHALK MARKERS LTD
Part Number	GP81216
Item Weight	2.79 ounces
Product Dimensions	1.25 x 1.25 x 6.25 inches
Item model number	GP81216
Is Discontinued By Manufacturer	No
Size	Wide Tip
Pattern	GROUT PEN
Thickness	15 Millimeters
Item Package Quantity	1
Number Of Pieces	1
Special Features	GROUT PEN
Included Components	GROUT PEN
Batteries Included?	No
Batteries Required?	No

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