Dont use t-cut on it mate use a clay bar over the whole car, sure it will remove most spots, dont forget to wax after polish
yep, a clay bar will sort it. I had exactly the same problem with my old boxster looked like tiny little rust dots, almost like sanded metal had been left on the surface to rust......no amount of polishing and cutting compound would remove it.
A Megs clay bar kit sorted it out with a couple of nice layers of DoDo over the top....it never came back after that.