I found it very easy to use and it instantly refreshes old grout lines to look like new! I used this on our white tiled kitchen counters and island, the area that gets the most discolored from food. I used to use white paint with a small paint brush to refresh the grout in the kitchen, but that would take time and start to peel off and not last that long. If chunks of grout actually came out (rare), I assume Id need to mix some grout and fill it with that, but for discolored tile, I just quickly use this on top of my old discolored grout lines, and its fantastic, I would buy this again for my needs. it probably helps that the tile is white too, but if i go over the grout line onto the tile, it easily comes off the tile. I just got this pen, so i couldnt review the longevity or easy to remove yet. I also dont know how this would work in the shower where water gets on it all the time, our shower tiles dont have white grout and arent discolored. But for the kitchen with white tile and white grout, its so far ideal!

This was my first time using a grout pen. It worked as intended. You can definitely see the difference from before. It took me a second to get the hang of using the pen, as far as shaking it, dabbing it, and then gliding it. Im an impatient person. I wore through the tip pretty easily. The seller was kind enough to send me replacement tips for no extra charge with a reminder of how to best use the product. From there, it was smooth sailing. I do wish that flow of ink was more consistent; thered be times when it would flow like an uncontrollable river and then other times where I had to dab and press to get the smallest amount out. In those moments, I thought the pen was dry...until the uncontrollable river would yet again flow. I guess im saying that its hard to know when the pen is actually dry. To grout seal my master bath floor, shower, upstairs bath floor, and laundry room, I ended up buying 4-5 of these pens. It adds up, but theres not much you can do about it. And its a good product. It did what I wanted it to do. I bought one last pen to have for touchups.

Product is excellent,however, tip of pen wears out too quickly and there is ink still left in pen

The only issue I have is the brush wore out too soon, but it did work very well, and I had to go over the grout twice. I may purchase another or see if they offer a new brush.

This product is easy to use and makes the grout look great, but the tip easily deteriorates, though Im not sure to what extent this is a problem with its actual application.

I wore the nub out before it was empty but I may have just been using it wrong. Impressed. Did a way better job than I expected. Recommend if you diy

I used this for my bathroom floor. The floor looks great and new. Very easy to use.

Covered my dingy grout but tip gets worn out quickly , they need to improve the durability of the applicator.

Its easy to use, except it was hard to get in the thinner grout lines, mostly wasted product on the tile going back and forth to get it down in the grout line. Using a damp cloth, it wipes right off the tile. I dont recommend for price and time, especially if you have small tiles! Im not sure how much I was expecting to get out of 1 pen, but I only got 6 sqft. (Thats 6, 12in by 12in square) I waited a few months to buy this product and now I wish I didnt bother. Debating if Im going to buy 4-5 more to wish my bathroom. Ugh

easy to use but the end brush flatten out quickly