How to install glass mosaic correctly

Clean the surface with a damp sponge just before installation of the Glass Mosaic Tile.
This installation requires that the Glass Mosaic tile be installed and grouted in separate procedures. This is commonly called the Two-Step Method.
Check with the Glass tile manufacturer to determine the type of adhesive recommended for installation of their product. Key the adhesive into the substrate using the flat side of a trowel to initiate a bond coat. Using the appropriate sized small square notch trowel, add more adhesive and notch the adhesive in a horizontal, straight pattern. Using the flat side of the trowel, flatten the notches to attain a smooth, consistent setting bed. Place the glass mosaic sheets onto the fresh adhesive and bring all surfaces to a true plane at the proper position. Use a flat wood block or rubber grout float to beat the face of the tiles and firmly embed the tiles into the adhesive or follow the tile manufacturers methods of bedding tiles. A minimum of 95% coverage, of mortar to tile, should be achieved after the beat in.
Apply the remaining sheets and make sure that the vertical and horizontal grout joints line up and a consistent pattern is maintained.
For paper faced mounted Glass Mosaics, allow to set before grouting. Paper can be removed as described above before or after setting.
For back-mounted and clear film face-mounted glass mosaic tile, allow the setting material to harden for 24 hours minimum (vertical installation) and 48 hours minimum (horizontal installation) prior to cleaning tile face and then grouting. Use warm water and a white scrub pad (or stiff nylon brush) to remove any residual setting material, glue or paper from the tile’s face prior to grouting. Allow the installation to air dry before grouting.
Better results have been obtained by using grouting as specified. It is recommended that a test area be performed to determine suitability of grout with glass tile. Sand may scratch the surface of the tile.
NOTE: Some glass tile manufacturers will allow the use of an epoxy grout. If instances where epoxy grouts are acceptable use the premium grout.
Notes: Exterior installations in hot and dry conditions can cause a rapid drying of the setting mortar. To obtain longer working time it may be necessary to dampen the substrate with a damp sponge immediately before the mortar is applied. Cold weather installations can slow the curing of the setting mortar. Longer waiting times may be required.