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

✨ Restore your grout, reclaim your space! 🖊️

EXTENDED COVERAGE - One pen covers up to 60 meters of grout—refresh your entire space effortlessly.
SAFE ECO FRIENDLY - Water-based, non-toxic ink keeps your home safe and fresh.
PRECISION RESTORATION - Reversible 5mm nib ensures flawless grout line coverage every time.
VERSATILE APPLICATION - Perfect for all tile grout types on floors and walls, indoors or enclosed spaces.
LONG LASTING PROTECTION - Anti-bacterial and anti-fungal agents prevent mould from making a comeback.

The Grout Pen Dark Grey by Rainbow Chalk Markers Ltd is a compact, water-based pen designed to restore and refresh dark grey tile grout lines. Featuring a reversible 5mm nib for precise application, it covers up to 60 meters of grout and includes anti-bacterial and anti-fungal agents to prevent mould regrowth. Safe for use on all tile grout types, this water-resistant, non-toxic formula is ideal for maintaining a clean, modern look in any indoor space.

Specifications

Material	As shown in the image
Brand	RAINBOW CHALK MARKERS LTD
Style	Compact
Item Weight	25 Grams
Item dimensions L x W x H	18 x 18 x 140 Millimeters
Water Resistance Level	Water Resistant
Item Form	Pen
UPC	722480211164 072248021116
Number of Items	1
Colour	As shown in the image
Surface Recommendation	Floor, Tile, Wall
Manufacturer	Rainbow Chalk Markers Ltd
Model number	GP81116
Item Weight	25 g
Product Dimensions	1.78 x 1.78 x 13.97 cm; 25 g
Item model number	GP81116
Item Height	5.5 Inches
Item Width	0.7 Inches
Included Components	1
Are batteries included?	No

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