For a correct choice of bonding material, different factors should be taken into account such as: material of the substrate to be covered (plasterboard, synthetic panels, plaster, wood, etc.), stability of the substrate, surface to be covered, environmental conditions, speed at which it is to be laid, etc. All these parameters will condition the choice of adhesive. The recommended bonding materials are adhesives that have been tested in our facilities, in controlled environmental conditions and on rigid brick and/or concrete substrates. In installations other than those indicated above, an initial test is recommended and in case of doubt, you can check with us or contact the adhesive supplier directly. When laying mosaic tiles, we recommend carrying out a test with at least 2 pieces before proceeding with the installation of the entire material. You should also check that the adhesive chosen is suitable for the material to be installed. For glass mosaic we recommend the use of white epoxy adhesives (to minimize the shade change of the glass (see adhesives table). It is very important not to apply adhesive layers higher than 3 mm, since the retraction of the adhesive can generate defects on the back of some finishes (see attached pictures). However, for stone mosaic, we recommend using C1 cementitious adhesive or C2 cementitious adhesive as a bonding material. It is essential not to use epoxy bonding material for this type of mosaic. For ceramic mosaics containing pieces with porous body (white and red clay) we recommend using C1 cementitious adhesive (see adhesive table), while for pieces with non-porous body (stoneware and porcelain stoneware) we recommend using C2 cementitious adhesive (see adhesive table). It should also be noted that C2 cementitious adhesive must be used for glass and stone mosaics. For glass and metal mosaics we recommend C2 cementitious adhesive or epoxy adhesive. For metal and stone mosaics it is best to choose C2 cementitious adhesive, as well as for mosaics with resin components. For mosaics with ceramic and metal backing (SIRENA COPPER, SIRENA GOLD, REFLECTIONS, METALIC SILVER, METALIC GOLD, BRONZO, ETERNAL, HYPNOTIC, MATRIX, URBAN) we suggest using C1 cementitious adhesive, C2 cementitious adhesive or epoxy adhesive. For mosaics made only in metal (CORTEN, HALLEY SILVER and HALLEY GOLD), it is necessary to use C2 cementitious adhesive or epoxy adhesive for a correct installation. Finally, for wood mosaics you must also take into account the different factors of the place where it is to be laid, and carry out a test before laying all the pieces. In particular, for the TROPICANA NATURA model you should use epoxy adhesives with flexible properties and suitable for wood. In addition, we recommend not to use too much adhesive material and to follow the adhesive manufacturer's instructions. In any case, it is essential to check that the adhesive chosen is suitable for the material to be installed and to carry out the relevant tests before laying all the pieces. Each mosaic has a downloadable technical data sheet on our website, it is very important to check it.