Answers

Hello Linda,

 Typically,  you do not want to cover existing grout. You will need to remove the old grout and apply your new colored grout. A tile contractor can help you with this project. Please let me know if you have other questions.

Thanks, Teresa

Hello Anthony,

 Cracks can occur for a multitude of reasons. I would recommend hiring a home inspector to take a look at your situation and get his professional unbiased opinion.

Thnak you!

 Teresa