Review on 🔍 Revive and Waterproof Your Tiles: Grout Pen Tile Paint Marker in Winter Grey - Narrow 5mm Tip (7mL) by Dan Dickey

Worked very well! The previously light gray grout in my washroom suffered from endless amounts of dirt (I won't say more) from my kids. I've cleaned it, bleached it, etc., but the grout along the path between the door and the toilet was still a dark grey. And they didn't glow. This pen did its job perfectly. There were a few spots that required two coats, but I was able to cover most of the grout well with just one coat. My grout lines were between two tip sizes and I went with the smaller tip size so I didn't have to wipe too much "excess" off my tile. I had to do more pen strokes this way, but it was worth not worrying about cleaning up afterwards. next few years!