Faded colour on Hot Toys Iron Man is a known problem. The faded only happened on rubber parts and occurred only on red.
The challenge face when fixing the faded red colour is that for every each Iron Man, the red are not exactly the same red. And therefore matching on the red make it more difficult.
One thing to point out is that for Mark 3 normal version, the red is actually the resin colour unlike the others, it is actually a repaint on top of the plastic resin.
On Part 2, will post all the final repaint after lining and battle damage is done.