This sounds like sodium silicate (or a similar silicate salt), a water soluble material that has long been used as a surface sealant. It is widely used to prot

This sounds like sodium silicate (or a similar silicate salt), a water soluble material that has long been used as a surface sealant. It is widely used to protect concrete surfaces. Chemical toxicity is minimal. Silicosis should not be a problem as long as the material remains reasonably soluble after application -- it will self-dissolve in the body. http://en.wikipedia.org/wiki/Sodium_silicate http://en.wikipedia.org/wiki/Sodium_silicate