Sanded grout is not ideal for narrow lines, as the sand can take up too much of the width and weaken the structure. [2] X Research source
This grout is also stickier and easier to work with than sanded grout, especially on vertical surfaces. [3] X Research source
Highly reflective polished stone is more likely to be scratched than honed stone, with a matte appearance.
Epoxy grout can discolor some porous, unglazed, stone materials. Seal the stone first before you apply the epoxy grout. [6] X Research source
If you’re concerned about matching throughout, you can also purchase either sanded or unsanded grout caulk, which is a mixture of the two.
Dust from black, green, and red grout tends to be more difficult to clean off surrounding materials, so make sure to wipe the excess grout away thoroughly if you choose one of these colors. [8] X Research source
If you have a large area to cover, consider mixing half the grout at a time, so the grout in the bucket doesn’t dry out before you’re done.
If you have a mixing drill and attached grout paddle, you can use that instead. Stay below 150 rpm to avoid weakening the grout with excess air bubbles.
If the grout gets watery, pour in a little bit more powder.
Leave your trowel on newspaper or other surface to prevent a mess.
If the grout has already hardened, you’ll need to discard it and make a new batch. Adding more water after slaking will not be effective.
