"Gene Kearns" wrote in message
I reasoned that it was a tar like product, as well. However, it
appears that technology has also plasticized this substance.

see: http://www.simcocoatings.com/t-200.html

I don't see it recommended for fiberglass, however....

That's interesting information. The bottom guy that I am working with
offers it as a spray-on barrier coat. I had never heard of it before.-Dano