Can I use this on expoxy grout?

Yes but if you have trouble with adhesion, try this product which is specifically made for epoxy grouts: https://www.amazon.com/dp/B01HQR70U2

How long does it take for it to dry? I poured a little water on it after several hours and the paint came off.

Grout Pen is dry to the touch in 5 min, but please allow a full 6 hours before getting wet. Grout Pen works best on unsealed grout. If your grout has been sealed previously this may prevent Grout Pen from being able to correctly adhere to the grout. Simple Solution: Skip scrubbing tiles and use a grout pen to clean, whiten, and recolor your grout 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 60 meters of grout Rich Pigments: Grout paint markers available in 11 different colors with reversible 5mm or 15mm nibs Advanced Formula: Non-toxic, water-based ink that helps protect against dark spots and stains

What kind of prep work needs to be done before using this product?

Wash and dry the grout first, then apply GROUT PEN. 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

Is one product enough for a small galley-kitchen floor?

Honestly it's difficult to say for sure, but the manufacturer says it can cover up to 40 liner meters (approx. 130 feet) of grout lines. Also grouts absorb the liquid at different rates.

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✨🖊️ Refresh Your Space, One Grout Line at a Time!

SAFE ECO CONSCIOUS - Water-based, non-toxic, and waterproof formula ensures a professional finish without harsh chemicals.
LONG LASTING COVERAGE - One compact 7ml pen covers up to 60 meters of grout, perfect for full kitchen and bathroom makeovers.
EFFORTLESS GROUT REVIVAL - Transform tired grout lines with zero scrubbing or bleaching—just pump and color for an instant refresh.
MOLD RESISTANT PROTECTION - Built-in anti-bacterial agents help prevent mold and mildew, keeping your tiles fresh and hygienic.
VERSATILE USER FRIENDLY - Reversible 5mm nib adapts to all grout widths, ideal for floors, walls, counters, and backsplashes.

The Rainbow Chalk Markers Limited Grout Pen in Brown is a compact, water-based solution designed to restore and recolor tile grout effortlessly. Covering up to 60 meters with a reversible nib, it offers a fast-drying, waterproof, and anti-bacterial formula ideal for kitchens and bathrooms—no scrubbing or re-grouting needed.

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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Manufacturer	Rainbow Chalk Markers
Part number	GP81110
Item Weight	25 g
Product Dimensions	9.5 x 1.4 x 19 cm; 25 g
Item model number	GP81110
Size	7ml
Color	Brown
Style	Compact
Material	Water Based
Item Package Quantity	1
Number Of Pieces	1
Special Features	Non Toxic, Water Based, Waterproof
Included components	Grout Pen
Batteries Included?	No
Batteries Required?	No

Rainbow Chalk Markers Limited Grout Pen - Designed for Restoring Tile Grout in bathrooms & Kitchens (Brown)

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