She added: “Then hold the nib down on some paper until the paint starts to come out.
“Use the grout pen like a regular pen, but be careful not to press down too hard as the paint will come out fast and overflow and you may quickly wear out the nib.”
Refreshing your grout lines: Use a grout pen to whiten the grout (Image: Getty)
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The best way to paint the lines isn’t tile by tile, it’s vertical and then horizontal.
Rachel said: “Use on vertical grout lines first. If you get any paint on your tiles don’t worry, you can use a damp cloth to remove it.