Non-sanded grout is generally used when the joints between tiles are 1/8 inch or less. Additionally, non-sanded grout should also be used when tiling with products that can be easily scratched, such as glass or marble tiles. Unlike sanded grout, non-sanded grout should be applied to a dry tile surface. Non-sanded grout can be sealed for further protection of the tile joints and to preserve the grout coloration. Non-sanded grout is available either pre-mixed or in a dry state that you will need to mix. By following the proper technique, and allowing ample curing time, using non-sanded grout is an easy process.
Remove all tiling joint spacers used during the laying of the tile. Clean the surface of the tiles with a damp sponge. Do not let water seep, or remain, in the tile joints.
Mix the non-sanded grout according to the manufacturer's instruction. When mixing a 25-pound bag of grout, you will need approximately two quarts of water. Mix in a bucket with a drill and grout mixing paddle for one minute. Allow the mixture to sit for five minutes. Then mix for one minute longer.
Wipe the tile surface with a damp sponge but do not leave the tiles wet. Scoop enough grout from the grout bucket to float onto the surface of the tiles, using with a rubber tile float. Often, an amount the size of your fist will be enough to start. Spread the grout over the tiles and into the joints with a rubber tile float.
Hold the rubber tile float away from you with one of the longer side edges against the tiles. The float should be straight on its edge with the bottom of the float facing you. Slide the float across the tiles while slightly tilting the float forward. Pull the float across the tiles in a diagonal fashion to remove excess grout from any needed areas. For smaller areas, you may use the shorter side edges to complete this step. Reapply this grout into other areas where needed.
Continue to add grout to your working area, using the rubber float to fill the joints and remove excess grout until your entire tiled surface has been grouted.
Allow grout to set up for approximately 20 minutes. Use a clean, damp sponge and remove any excess grout. Use the sponge in a diagonal motion. Your effort should remove excess grout from the tiles but not from the joints. Clean your sponge often, and keep the sponge damp, not wet.
Allow the grout to cure for three hours. Then, using a clean, damp sponge, buff the tops of the tiles to remove any haze remaining from the grout cleaning. Follow up with a clean, dry cloth for a final buffing.
Apply grout sealer, if needed, according to the manufacturer's recommendations. If grout sealer is needed, wait at least 48 hours before applying. Always refer to the grout sealer manufacturer's recommended curing time for the grout as these times often vary.