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Before grouting, caulking, and finishing your job, wait at least 12 hours for the mastic to dry and the tiles to set. If you don't, you could wind up displacing your tiles. Move over your tiles from the left to the right and remove all of the spacers you placed to separate the tiles from one another. If you don't remove the spacers before applying grout, you'll have problems with your grout in the future. If the spacer won't come out, use a flathead screwdriver to pry it out. Be careful not to damage the tile. While you can mix your own grout, it is much easier to purchase premixed grout and apply it without preparation. However, make sure you don't open the grout until you're ready to use it. If you open it earlier, it may begin to dry before you use it. Scoop up a generous amount of grout from your bucket with your float. Spread the grout over the spaces between your tiles. Apply extra grout, as you want to make sure you're completely filling all grout lines. Avoid filling the space between your tiles and your counter, appliances, or windows. You'll fill these in with caulk later. Run your float lightly across the grouted portions of your tile. Use it to scope up as much excess grout as you can. By removing grout, you'll make your cleanup process a lot easier. You'll also be able to use the excess grout elsewhere in your project. Take a rounded tool and run it along your grout lines. This will give a slightly concave appearance to your grout lines. It will also help to compact the grout and fill any pockets that aren't already filled. Dampen a sponge in cool clean water. Wipe your tiles in a back-and-forth fashion. Rinse your sponge after you've wiped down one 4 foot (1.2 m) row of tiles. Continue to wipe your tiles until you've removed any grout or grout haze that remains on them. Use a caulk that closely matches the color of the grout you used. Squeeze your caulk gun or the tube slightly to push out just enough caulk to fill the gap. Finally, dampen one of your fingers in warm water and use it to smooth the caulk. You can use a rounded end of a pen, pencil, or another object instead of your finger. Place painter's tape on the face of the tiles adjacent to where you'll caulk. Remove the tape shortly after you've applied the caulk.
Allow the tiles to set overnight. Remove spacers from between your subway tiles. Open your premixed grout 15 minutes before you use it. Spread grout with a float back and forth. Remove excess grout with a float. Shape your grout with a pen, pencil, or the rounded edge of a float. Use a sponge to remove any grout haze. Caulk the edges between your tiles and cabinets, windows, and appliances.