for the life of me I can't figure out what is in it except for silicon. Other than that it just says "metal binding groups" without any explanation of exactly what that means.

I am always VERY suspicious of products that are being sold with very vague and very scant information about what exactly is in them. It makes me suspect that they either have innocuous worthless fillers in them, or they have everyday ordinary substances that you could find a lot cheaper elsewhere, or they possibly contain dangerous elements. God only knows

Point is how can you have an intelligent opinion about something that they refuse to tell you what's in it?