blueman wrote:
I need to repair some tiles in our bathroom. I did a reasonable job of
matching the color using Mapei Ultracolor sanded grout.

However, the surface texture of the old (sanded) grout is more like 60
grit sandpaper (like popcorn texture in miniature) while the surface
of my new grout is more like trowelled morter.

Do I need a special type of grout or additive or finishing/tooling
technique to get the grout to have a similar texturing?

Thanks

While I have found that Mapei sanded grout seems to use a very fine grade of
sand in it, it is also possible that water, cleaning compounds, etc. have
etched the cement portion of the grout over the years, revealing the sand
granules to stand proud of the surface, giving the "60 grit" texture. The
only thing that comes to mind would be to re-grout over the old grout with
non-sanded or possibly the new sanded grout, however, this is subject to
testing in a hidden location, and may fail to stay bonded to the old grout
surface.