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!!