Review on Revive & Waterproof with Grout Pen Tile Paint Marker: Yellow Cream, Narrow 5mm Tip (7mL) by Billy Reeves

This is amazing! After 10+ years of uncleaned grout and a failed renovation, the bathroom floor in this home looked terrible. Two handles covered the whole floor in the bathroom, with the 2nd handle there was still a lot left, even after 2-3 layers (which you definitely need, since the paint is a bit watery and also soaks into the joints). Very easy to use, works like a normal marker. Remember to press the tip of the pen onto a separate (thick) fabric to activate it before actually using it on the grout so you don't end up with a big mess on the tile when you paint for the first time expires. When you see the first side of the tip is worn out, simply pull it out and flip it over to the other side.