GroutGlo – Waterproof Grout Pen for Bright White Tile
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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.
30-day at-home trial
Try GroutGlo at home for 30 days. If it doesn't deliver the intended result or isn't as easy to use as described, return it for a full refund.
Frequently asked questions
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.
Specifications
- 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
