[xoxoxoBruce]

Yes, it's an epoxy paint like we use on airframes. Concrete doesn't stick to the iron work, it get it's purchase from the shape of (bumps on) the rebar.

1~When normal people see the school bus the normal reaction is, Oh, innocent children... an emotional response.
2~Then a normal person would move on to concern for the other victims.
3~The normal progression would be to then move to how and why this happened.
This sometimes happens all in one post, but more often in a progression of subsequent posts.

The problem tw has, is he doesn't acknowledge your point and add his own, or even ignore your point and add his own... he often condescendingly belittles other people for stopping at #1 or #2 and not moving on to #3 immediately.
I suspect it's because he feels his point is more important due to his superior knowledge.
It's exceedingly annoying, but he sloughs off this flaw as being unemotional, in his own condescending style, which just pisses people further.