Welcome to the Cellar, davistud.

Can't be fiberglass because it would char to powder. Only thermo-setting materials can do the taffy imitation. Plastic is still in the running though.

I think what you're seeing as light coming through, is actually direct light on parts of a three dimentional "sculpture" of sorts.

Hell, you're in Texas, Run out and check for us.......please. :lol:

Yeah that sign just looks TOO familiar. It is either a buried gas pipeline sign, you know, don't dig here or something. OR it is a no trespassing sign offering a 5000$ reward for stolen cattle from the Farm Bureau. I have seen it a thousand times and it is one of those I bet.
OK the light I am seeing is on the pieceof plastic BETWEEN the reflection you see and the bolt. There is a curve in the plastic there. The reflection is on one side of the curve and the light passing through the material is on the side closest to the bolt. Hot reflection, then a more subtle translucent pass through of light. Gotta look close.

The rectangular area outlined by 1-2-3-4 ?
Looks to me like it's a rectangular washer under the bolt head. Not translucent but that color, probably metal, and flat against the mounting steel.
If that's the case, then the sign must be plastic as they wouldn't need a retainer that size to hold a metal sign.

That means the Farm Bureau, or their agent, lied....and probably killed Kenny, too. :(

Looks like plastic to me. Aluminum doesn't have a plastic state between liquid and solid. It would no more flow like that than an ice cube would.

Lots of thermo plastics will act like taffy at 150-200 degrees but won't burn until double or triple that. It is what makes vacuum forming possible.

who cares?!!!

I do. A little.

I dont believe it...still goin? take a breather folks! Lifes a bit too short ;)

I've seen burned aircraft pictures where the aluminun did distort and stretch like this. That said, I believe it's plastic. :D