Is this product waterproof or will it wash away if I apply it to the shower floor tiles? tia

Yes Grout Pen is waterproof. Grout Pen is specifically design for wet areas including showers, bathroom floors, around sinks, kitchen counter and backslash. LOOK BRAND NEW AGAIN: 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 150 feet of thin 2mm grout RICH PIGMENTS: Grout paint markers available in 11 different colors with reversible 5mm Narrow or 15mm Wide nibs ADVANCED FORMULA: Non-toxic, water-based ink that covers grubby grout stains making it look brand new again

Can you put sealer over it?

Nope. It looked beautiful until I put a sealer over it. (I should have searched for "sealer" before I even bought it. :-( ) Don't waste your money.

Does it work on silicone caulk?

Silicone caulk is not paintable so this product would likely not work on it.

does it work on marble tiles grout?

Yes, it works on grout, but it does not last long. I would guess a white sharpie would work just as well.

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Description

✨ Refresh your tiles, reclaim your space! 🖊️

EXTENDED COVERAGE - One pen covers up to 100 feet of grout—ideal for both quick fixes and full-room makeovers.
SAFE SUSTAINABLE - Water-based, non-toxic formula ensures a safe refresh without harsh chemicals.
VERSATILE APPLICATION - Perfect for bathrooms, kitchens, backsplashes, and any tiled surface craving a fresh look.
EFFORTLESS GROUT REVIVAL - Transform dingy grout lines into pristine white in minutes—no scrubbing required.
PRECISION MEETS DURABILITY - Wide tip delivers smooth, even color that resists water and daily wear.

The Grout Pen White Tile Paint Marker features a wide 15mm tip and waterproof, non-toxic ink designed to recolor and seal grout lines up to 100 feet. Ideal for unsealed grout on tile surfaces in kitchens, bathrooms, and more, it offers a quick, durable solution to restore grout’s bright white appearance without harsh scrubbing.

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 PEN
Supported Standards	ASTM-D4236
UPC	722480212086
Unit Count	1 Count
Global Trade Identification Number	05899406109500
Number of Items	1
Color	White
Surface Recommendation	Tile , Floor, Tub, Shower, Countertop, Backsplash, Sink, Wall, Patio
Manufacturer	Rainbow Chalk Markers
Part Number	GP81208
Item Weight	2.79 ounces
Product Dimensions	1.25 x 1.25 x 6.25 inches
Item model number	GP81208
Is Discontinued By Manufacturer	No
Size	Wide Tip
Pattern	GROUT PEN
Item Package Quantity	1
Number Of Pieces	1
Coverage	40 linear meters
Special Features	Non Toxic
Included Components	GROUT PEN
Batteries Included?	No
Batteries Required?	No

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