Finally got the Grout and was able to finish the patching. Learned a few things.
The Grout is not like household tile grout. It is more like the texture of wood glue. Smooth, not sandy.
Used a blunt syringe, but I think one with a needle would have worked better. Used a wooden paint stir stick to push in the grout. The tiles are too small to use a rubber trowel.
Used a Dremel with a grout removal bit to remove the old grout in spots. Used the slowest speed, which was more accurate
Good to start with the cracks on the feet first. My first few patches took a lot more time to clean up. Once I got the feel for it, it was cleaner.
A few unknows. : Now that the tube is open, what is the shelf life of this un-used grout. What is the drying time? 24 hours seems dry, but do I need to heat up the Kamado, to set the grout?