Whats the best adhesive for outdoor mosaics?
It is probably best to avoid adhesives altogether and use thinset bonding mortar (a sticky concrete) instead. Liquid Nails Adhesive would probably be best for outdoors, if you have to use an adhesive. It’s thick and tarry and bonds to anything, but it is solvent based and the fumes are an issue. We use Weldbond adhesive for mosaics for indoor mosaics where water or rain isn’t an issue because there aren’t any fumes and clean up is much easier. We have used Weldbond successfully on several outdoor projects, but these pieces were grouted and sealed very well, and they were vertical surfaces that didn’t have water standing on them. Liquid Nails Adhesive will probably resist extreme freeze-thaw cycles better. Ask questions and read labels at your local building material store.
