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Best grout pen

Updated: 21 October 2026

You are looking at yellowed bathroom grout and a row of white pens that all claim to revive it. This page uses one criterion from the [Grout pen](/hub/flooring-tools-and-accessories/grout-pen) set captured on amazon.co.uk on 19 October 2026: a published method plus the largest review count, then a cheaper white pack with spare nibs. The top pick is the UniBond three-pack at about £12.60, rated 4.1 from 20,843 reviews. The best value pick is the QHSXMQ eight-pack at about £5.99, rated 4.1 from 46 reviews. Neither fills a failed joint or stops mould fed by a leak. Peter F. scored these listings, not a lab, and amazon.co.uk links may earn a commission.

You are looking at yellowed bathroom grout and a row of white pens that all claim to revive it.

Our top picks

UniBond UniBond grout reviver pen, white, pack of 3

Best overall

UniBond UniBond grout reviver pen, white, pack of 3
8.7/10about £12.60
View offer
QHSXMQ QHSXMQ white grout pen, 8 with spare nibs

Best value

QHSXMQ QHSXMQ white grout pen, 8 with spare nibs
8.7/10about £5.99
View offer
DRTRU DRTRU white grout pen, pack of 5

Alternative

DRTRU DRTRU white grout pen, pack of 5
7.7/10about £9.99
View offer
On this page
  1. 1.What “best” means on this page
  2. 2.Top pick for a small glazed bathroom
  3. 3.Best value if you want white and spare tips
  4. 4.Who should skip both

What “best” means on this page

“Best” means the white pen with a method on the brand’s own UK site and a review sample one comment cannot swing. UniBond’s page describes a water-based coating, a fungicide, vertical joints, and a second coat after one hour. The three-pack, B0CKM441FW, was rank 1 in Tile Grout on that capture. DRTRU’s five-pack scores 3.6 from 367 reviews, and those reviews keep returning to leaks and pens that dry after a little liquid. Colour, tip and pack size are in the grout pen buying guide.

Top pick for a small glazed bathroom

The UniBond pack is three 7 ml ice-white pens from Henkel. Live bullets repeat a waterproof line, a mould-resistant claim, about 60 metres on a 2 mm joint, and about 60 minutes before the line is ready. Metro, on 16 October 2023, repeated the brand line that you can shower after 60 minutes. UniBond’s FAQ calls the pen a mid-term cover for ingrained colour. Press hard and the felt nib shreds. The drawing sequence is on how to use a grout pen.
UniBond UniBond grout reviver pen, white, pack of 3

Testsieger

UniBond UniBond grout reviver pen, white, pack of 3
8.7/10about £12.60
View offer

Best value if you want white and spare tips

QHSXMQ, B0DL9RBFDS, is eight white pens and eight replacement nibs at about £5.99, 4.1 from 46 reviews. One buyer said a single pen did about 8 metres on 4 inch tiles. Spare tips matter because felt furs before the liquid is finished. The spec block does not mark these pens as waterproof. Do not borrow UniBond’s 60-minute shower line. Reviewers say the tip is very hard and the liquid comes out too fast, and one person saw colour wash off after about a week. Choose it for a small white joint when spare nibs matter more than the branded method.

Who should skip both

Skip both when the grout you want is not white. Flintronic’s light-grey ten-pack is about £8.98 with 3.8 from 1,747 reviews, though the title says ten pens and one bullet says six. A bright white pen on cream or grey grout is a common regret. Skip both when the joint powders, the tile is loose, or water reaches the room below. A marker coats what is already there. Shower walls can be a fair cosmetic job on sound, dry, glazed tile. Shower floors wear a coating off in patches. Black growth in the silicone at a tray is a silicone job, not a pen job.

Common questions

Which grout pen is the top pick in this set, and for whom?
The top pick is the UniBond three-pack, B0CKM441FW, at about £12.60 with 4.1 from 20,843 amazon.co.uk reviews on 19 October 2026. It is for a small glazed bathroom with sound white joints, because UniBond publishes a method and the review count is far larger than any other pen here. It is a mid-term cover in the brand’s own FAQ, so you should expect a refresh you may repeat, not a new joint.
Is the cheaper white pack a fair alternative?
Yes, if you want white spare nibs and you do not need a waterproof line in the spec. QHSXMQ’s eight pens and eight nibs are about £5.99, with 4.1 from 46 reviews. One review mentions about 8 metres on 4 inch tiles. Reviews also describe hard tips, fast flow, and colour that washed off in places after about a week, so it is a fair cheap alternative for a small wall, not a copy of the UniBond instructions.
Why not the five-pack with 367 reviews?
DRTRU’s five white pens are about £9.99 and score 3.6 from 367 reviews, so the sample is large enough to trust the pattern. That pattern is leaks, liquid that follows gravity on walls, bright white against old grout, and pens that dry after a little use. Some buyers poured the liquid out and brushed it on. A lower price than UniBond does not outweigh a nib that will not hold a line.
Does a high star score with one review count?
No. Elixvane is the caution here: 1.0 from one review that says the pens do not work. A single five-star review would be just as weak. Jiyeo and DCYQAIN have no rating line in the capture at all. This page only treats a star score as useful when there are enough reviews to show a repeated fault or a repeated success.
Will the top pick last for years in a shower?
UniBond calls the coating mid-term, and one review in this file said a shower looked fairly good. Another floor user with dogs expected to redo lines at least twice a year. There is no British Standard for how long a grout pen lasts, and this page did not run a wear test. On a shower tray, foot traffic is a reason to read the shower page before you buy either pick.
Is a single UniBond pen the same product as the three-pack?
It is the same 7 ml family, and a single pen was listed near £3.40 in the same search window, against an RRP of £6.17. That price is not a row in this comparison. The top pick is the three-pack at about £12.60 with the 20,843-review line attached to B0CKM441FW. Check the live page so you are not buying a different fill or a different colour by the title alone.

Related pages

Grout pen in a shower

Grout pen

Grout pen buying guide: joint, colour, nib, and price

How to use a grout pen on clean, dry bathroom joints

Grout pen vs grout paint: pen, colourant, or new grout

Sources

Public UK sources used for this comparison. Listing prices, stars and review counts are the amazon.co.uk figures saved for these 12 ASINs on 19 October 2026.

  1. UniBond Triple Protection Grout Reviver Pen (retrieved 19 October 2026)
  2. UniBond label details via McGrocer (retrieved 19 October 2026)
  3. ASDA: UniBond grout reviver pen 7 ml (retrieved 19 October 2026)
  4. Consumer Rights Act 2015, section 9 (retrieved 19 October 2026)
  5. HSE: Treated articles (retrieved 19 October 2026)
  6. Bromley Tilers: How to clean grout (retrieved 19 October 2026)
  7. Homebuilding: Cleaning grout (retrieved 19 October 2026)
  8. Ideal Home: Grout colouring with a grout pen (retrieved 19 October 2026)