I would like to create a mosaic on a plain wall in the garden using pebbles, shells and coloured wall tile. What sealer should I use to protect against weather and frost?
For an outdoor mosaic the correct adhesive and grout is even more important than your sealer. Do not use a water based adhesive for exterior projects, use a thinset bonding mortar. These products are all available at your local building supply store. If you are still not sure, read the label of the product, it will have recommendations such as “For indoor use” or “For outdoor use”. Same goes for your sealer, make sure you use an exterior grade sealer, ask at your local building supply store. Re-apply a sealer every year afterwards.
