After tiling a countertop, you should let the mortar dry according to the manufacturer's instructions. While it may be only a few hours, waiting overnight ensures that everything is well set when you get back to work., Remove the vinyl tile spacers. Then, use a rubber float to press grout into the grout lines. Work smoothly and methodically, using a rubber float to spread the grout and wipe up any excess.


Remove excess grout by holding the rubber float at a 45-degree angle and dragging it across the tiles in a diagonal direction.
 Once the grout is evenly distributed in the joints, clean the grout off the tile faces using a damp sponge. This should wipe off any residue or grit that got on the tiles while installing.


Only swipe over the surface of the tiles -- do not dig into the grout lines.
 To protect your tiles for years, you'll want to apply a finishing solution to the grout. Find a grout and tile sealer that works for you at your local hardware store and apply according to the directions on the bottle.
Allow the mortar to set overnight.
Grout the tile countertop using the grout of your choice.
Clean the tiles with a damp sponge when finished.
Allow the grout to dry before adding a finish to the counter.
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