What is the difference between Indoor Art and Garden Art you may ask… The difference is in the materials. For the garden, water proof/resistant substrates, such as cement and cement board are used. Sculptures are carved from styrofoam, then covered with overlapping pieces of mesh tape and a few coats of cement before tile is applied. Adhesives include thin-set and silicon. To finish up, a sealer is used to protect the tile and grout against the elements.
As with anything left outdoors, a mosaic can take on a unique weathered character, which can change over time and be quite beautiful.