Repairing busted grout

[WillB]

Home Depot had the Sika product for $12.99 for a 26 oz tube. I'll check WalMart, too.
I think what was originally used was a similar product. It looks like mortar but it's rubbery instead of hard and brittle.
I'll go with your suggestion.
Thanks for the tip.

[nefretrameses]

If you did use a grout product, apply it with a piping bag. Its a cone shape with a small opening at the tip of the cone. Fill it with grout and squeeze. Bakers use the same kind of thing for cake decorating. They can be gotten at Lowes.