Fscaleirish,
It's been my experience that a lot of model train colours are not always correct, so commercially available paints will not match, and if you are indeed in Ireland, not sure if you will have access to any anyway!
As Scot suggests, probably try to find a paint store that can match it with a machine, although that is not necessarily perfect anyway!
So, good luck!
Scot,
Before you put the blame on Rustoleum, I think that will find the instructions say apply second coat within 1 hour or after 48 hours.
You said that you applied a second coat after 24 hours!
I normally leave any spray painted parts for a whole week, just to be sure, as one can never be sure if it is thicker than it should be after the first coat.
Anyway, what a great project, well done.
I hope that when people see the locos that they can appreciate just how much effort you put into them.
Regards,
David Leech, Canada