Entity Terry Kay spoke thus:

> Could you please "splain" the difference between high desity fiberglass,
> cloth or resin, and low density.
>
> I've been repairing this stuff for a long time and have never run into
> any variations of the material.-----
Try burning it. You will see that "structural" fiberglass is a much heavier
fiber that "finishing" fiberglass, which is a higher proportion of resin
making it smoother for finish work.

> Oh, and just to set the record straight, regardless of which one or the
> other it is, fiberglass cloth, matting or resin, even dryed, is highly
> flamabale,
There is a big difference between "flammability" and "ignitability".
I challenge you to burn a fiberglass engine cover by holding a match under
it!