Rainbow Chalk Large Grout Pen - Grey

Yes, it is suitable for both wall and floor grout, provided the floor is not subject to heavy, abrasive scrubbing.

It typically dries to the touch within a few minutes, but it is best to leave it for at least one hour before contact with water.

Yes, the ink is non-toxic, making it safe for use in standard household environments like kitchens and bathrooms.

It is designed to cover stains on existing grout; if you are trying to change the color of dark grout to grey, multiple coats may be required.

The formula includes protective properties; while not strictly necessary, some users prefer a clear grout sealer for high-moisture areas.

Ensure the cap is removed and firmly press the nib down onto a hard surface repeatedly until the valve releases ink.

Clean the grout surface more thoroughly and apply a second coat once the first layer has fully dried.

Remove the nib carefully with tweezers, flip it over to use the unused end, and reinsert it into the pen housing.