I was reading an old Mold Making and Casting Handbook.
It had a whole page warning about the dangers of Fiberglass.
THe fumes are harmful to your lungs in a very bad way.
The hardener is a type of acid I believe, it explained if it splashes in your eyes it can do IRREVERSIBLE damage!
Anytime you see IRREVERSIBLE DAMAGE. Take it seriously. Dont be scared, just be aware. It is a very easy product to work with. But you must Respect it.
When I use it I wear DOUBLE LATEX gloves, long sleeve shirts, and clothes I dont mind messing up. I wear eye googles and a proper respirator. I also do it out side. I have a slew of Mixing cups and an endless supply of Chip Brushs.
I prefer using the fiberglass MATTE as opposed to the CLOTH. The matt is nice because you can tear it up into fibers which you can wedge into alot of cracks and tight places.
The cloth, to me, is better used on SMOOTH surfaces. Like a Surf Board, or Boat hull.
Be very methodical using the stuff. It is dangerous, but produces GREAT results when you give it time and respect.
Hope this helps.