GroutGlo – Waterproof Grout Pen for Bright White Tile

Bright white grout in one stroke

You scrub. You bleach. You scrub again. And the grout still looks dirty.

It's the one thing that makes your bathroom look old — no matter how clean the rest is.

The GroutGlo pen paints over years of yellow stains, mold marks, and grime in a single stroke — locking in bright white with a nano-seal that stays put through 730 days of showers.

No scrubbing. No mess. Works right out of the package.

Tested through 1,100 scrub cycles and still bright white

✓ One stroke covers years of stains
The 2mm precision tip glides over yellowed, moldy grout and locks in bright white in seconds. No primer, no scrubbing, no second coat.

✓ Stays white through 730 days of showers
Nano-seal formula blocks out water, steam, and soap. Pressure-tested at 80 PSI so daily hot showers won't wash it off.

✓ Works on every tile in your home
Kitchen counters, shower walls, floor grout, sink edges, even caulk seams. One pen, every room — no contractor needed. 

✓ Safe to use around food and family
Low-odor, non-toxic formula dries smudge-free in 3 hours. Breathe easy while you work — no harsh chemicals lingering after.

✓ The $19 fix that looks like a full re-grout
Skip the $400 contractor quote. One pen restores an entire bathroom and leaves it looking brand-new for years.

What you get today

• GroutGlo waterproof grout pen (1 pen)
• 2mm precision tip — fits the narrowest grout lines
• 730-day waterproof nano-seal coverage
• Works on tile, caulk, ceramic, metal, wood
• Free tracked shipping
• 30-day money-back guarantee

Seasonal production run — once this batch sells out, restock pricing may change.

A quick way to make your tile look brand-new before the holidays — limited stock available.

How long does it really stay white in a shower used every day?
Up to 730 days based on standard pressure testing. Most users see clean white grout for well over a year of daily use before any touch-up is needed.

Can I use it on colored grout, not just white?
Yes — it comes in white, black, gold, and silver. Pick the color closest to your existing grout, or use white to fully refresh older stained grout.

Do I need to prep the grout before applying?
A quick wipe with a dry cloth is enough. No special primer, no sanding, no scrubbing needed first.

Will it stain the tile if I go outside the line?
No — wipe any overspill off the tile within a minute and it cleans up easily. The nano-seal only bonds permanently to porous grout, not glossy tile.

How to use

• Wipe the grout line with a dry cloth to remove loose dust.
• Shake the pen for 30 seconds, then press the tip down a few times to start the flow.
• Run the tip along the grout line in one smooth stroke.
• Let dry for 3 hours before getting it wet.

• Size: 5.7 x 0.8 in
• Material: Metal shell, oil-based waterproof ink
• Tip: 2mm precision tip
• Lasts: Up to 730 days waterproof per application

We love our products and are confident that you will too! That’s why we offer a 30-day return policy. If you're not satisfied with your purchase for any reason, you can return or exchange it within 30 days

We offer Free Shipping on all orders within the USA.

Every package is shipped securely with UPS, and you’ll receive your tracking number within 1 business day so you can follow your delivery every step of the way.