We offer a product called RayCrete, a non epoxy material. You can use it to fill, patch, glue, repair, restore or create. I have used it on glass kayak repairs and it does well. I have some small samples I could send out if you are interested. You can see more about the product on my website under building and repair. It can be colored with chalk dust.

I do have some skin sensitivity to the material when sanding. I would suggest taking the same precautions you would use when working with regular epoxy.