if you are looking to make a airsoft riot shield and use guns up to 400 fps this instructable is worth looking into because it is cheap and strong.
Step 1: Materials
window screen(i had onne lying around)
duct tape (optional)
2 rolls of clear packaging tape(i used scotch mailing and packaging tape)
some time(it can take a while)
Step 2: Layering
First lay the first strip of tape horizontally acrost the top trying not to make air bubbles. next continue to lay strips overlapping them slightly until you get to the bottom.
NO AIR BUBBLES!!!!!!!!!!!!!!!!
Step 3: Layering Cont.
add a vertical layer over the last one and put a layer on back. if you want to make it even stronger add another layer on the back
Step 4: Detail
now i added a duct tape border around the edge