>>8051322In theory if you could find a resin with the same refraction index as your clear plastic and put it under the appropriate pressure while it cures you could fix it the same way people fix their windshields.
But for all practical purposes the answer is no. Melting plastic wouldn't work because dissolved plastic will not have the same refraction index as the original because the original was hot and under pressure when it formed.
Your only realistic options are recasting, buying a replacement or painting over with some opaque paint like metallic.
