The reason is that wood swells and contracts due to humidity changes in the air, and tiles will start to fall off eventually, and usually sooner than expected. First, wood should never be used as a backer for outdoor mosaics, even those kept relatively dry. However, outdoor mosaics and wet mosaics like pools and fountains require different backers and cements. For these indoor mosaics, wood can be used as a backer, and we recommend the “glue-then-grout” method using Weldbond glue, a water-based PVA adhesive with no fumes. Our regular mosaic instructions page is written for indoor mosaics not subject to standing water such as a shower floor. Outdoor Mosaic Patio Table with bench seats by Naomi Haas. Make sure the glue cures for 48 hours or more before grouting.Mosaic techniques for outdoor table tops, patio floors, fountains or birdbaths.Cut the tile small enough so that the flat tile can fit to the rounded vase.Simply lean the vase on the side and glue one side at time. Glue can be runny, and tiles can slide off.If necessary, scuff the vase with sand paper to ensure that the glue bonds securely.Here are some tips for grouting mosaic vases made from glass mosaic tile: However, they do require a LITTLE extra work because they are usually glass and usually rounded. Vases, votives and lamps are popular mosaic projects because they don’t require any extra work to figure out how they will be displayed or hung on the wall. The last step in grouting is appropriately called “hazing.” Simply buff this haze away with a clean dry cloth. The day after you grout, you may notice a residue or haze on the surface of the glass mosaic tile.Don’t erode the wet grout from the gaps between tiles.This step requires more passes and more care if the surface is uneven or the gaps between the tiles are too large. Then make repeated passes with a damp sponge (not dripping wet). Press the grout in thoroughly and wipe away the excess. Grout is applied by rubbing the grout into the gaps with a spatula, trowel or rubber glove.After an hour, mist LIGHTLY with a spray bottle if needed. It hardens by hydration, not dehydration. Don’t let the grout dry out as it cures.Mix the grout according to manufacturer instructions.Cutting the tile into smaller pieces may also help on rounded surfaces. Use a water-proof solvent-based adhesive if necessary. Keep in mind that wet grout may loosen water-based adhesives. Be gentle with these when you apply the wet grout so that you don’t knock off any tiles. However, artistic mosaics on surfaces that aren’t flat (such as a mosaic vase) tend to have corners of tile that stick out. This usually isn’t a problem with glass mosaic tile because most varieties are relatively flat. Make sure that the surfaces of your mosaic tile are relatively level. Use sanded grout if the gaps between tiles are greater than 1/8″ Grout is concrete, and it needs reinforcing the same way that concrete in roads is reinforced with gravel and iron bar.Allow the glue to cure for at least 24 hours before you grout.This step isn’t necessary with glass mosaic tile because smooth glass is nonporous. This prevents the grout from staining the porous surfaces.
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