one could say its shiny

Rudolph's nose?

thinset mortar, spread out with a notched trowel?

Nope , not his ass eather

looks like a weld or an electron microscope shot of something. Maybe it is a picture of water and sand in the sunlight.

Yeah, was thinking of electron scope of something that has 'tinning' or solder...not even close, eh?

I think it's something spread out with a v-notched trowel. Maybe not thin set mortar. Maybe vinyl floor adhesive. Something like that.

Nope nope and Nope

foil on the grill?

This is a tough one. I like.

nope

Here is a Hint

Its Bigger than a bread box
But smaller than a Bus

Scale platform?

God I hope Not !!!

Corrugated roofing

Nope
Dude check yer Spex :)