I have to recoat a section of a flat roof - now it is asphalt cement.

I was looking at some of the new elastomeric coating that claims it
can stretch 300% and will not crack or leak even with joint movement
and the Miami hot sun and high humidity. I also see something called
aluminum coating - it's mixed with aluminum fiber and the finished
coat is silver in color?

Any experience which one may be better?

Now the question is, if elastomeric coating is as good as advertised,
why would anyone still buy the old ashphalt cement bad smelling tar
like coating?

Thansks,

MC