According to Weldbond's literature, it is:
Non-flammable, non-toxic & dries clear
Unmatched as a primer for porous surfaces
Highly water-resistant & impervious to petroleum, oil, grease, salt, moulds and fungi, alkali's & weak acids.
Withstands all climatic conditions after curing
Non-staining and will not become brittle with age
Highly concentrated, can be mixed with water and used a a sealer for many surfaces.
Tested and approved by CMHC for use in National Housing Act Construction
What they forgot to say is that it is my FAVORITE adhesive when creating mosaics!!