If it's fiberglass, I'm not sure what CAN be done with it, but I'll leave that up to those more experienced in various materials.
For lenses, it can be really simple. For my TD's lenses, I went to Meijer and bought a replacement faceshield for dirtbike helmets from the sporting goods section. Clear, flexible, seems blue but that's because of the protective contact film. You can also get protective faceshields from Home Depot. I also bought a roll of the darkest window tinting from Meijer's automotive section.
Remove the contact film from the faceshield, and trim a piece of the window tinting slightly larger than the shield. I believe the instructions on the tinting is pretty accurate, so I might be repeating here, but it just required a spray bottle of water with a drop or two of liquid dish soap and a credit card.
Spray the shield with the water/soap solution, peel off the backing from the tinting, then slowly and carefully apply it to the shield, working from the center outward. Use the credit card to push outward in all directions to smooth out any bubbles (the liquid solution acts like a lubricant to help in the adjustment but there's not enough soap to dissolve the adhesive).
Once the tinting is applied smoothly, lay it flat to cure. Probably about a day or two (or whatever the instructions on the tinting say).
Then trim to shape and voila! Discount lens (well, maybe not the cheapest, but definitely much more DIY and instant gratification
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