
The tile "lines" in our bathroom looked like the grout was dull; I found out that it was actually concrete. So instead of being upset it wasn't grout and quite permanent, I purchased these pens to give the bright white grout line illusion. The middle is done while, for comparison, left the bottom. Overall.quite pleased!

Versatile 16Pack Oil-Based Paint Markers For DIY Crafts On Any Surface - Waterproof And Long-Lasting
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