From what I understand it shouldn't as long as its cured properly. I looked around and found this info on 2 different websites one of which was written by a veterinarian, I won't take any chance and I'll do as it says. Another website recommended to do this same routine with 100 degree water.
Fiberglass
polyethylene, and polypropylene liners are all relatively inert materials.
They do need to be carefully leached to remove toxic metals and plasticizers used
during the manufacturing process. One leaching procedure is to soak the material in
HCL (pH 3.0) for 24 hours, then at pH 11.0 with sodium hydroxide for 24 hours, repeat
the pH 3.0 for 24 hours, and finally rinse with salt water.
That article is talking about the mat itself. I believe the resin leaches out the chemical during the drying process, thats what causes it to get HOT as the chemical react. I have seen tank builds with 1/2" glass for the front and plywood sides lined with fiberglass mat. I dont thn k it will be an issue. LOOKS GREAT!!!