Have you read this MX250 build with a DIY yellow paint job?
(Page down a bit to get to the start of the painting.)
I seem to remember there were some comments on the fact you might need more paint if you are using yellow.
Whatever you do, definitely buy a lot more paint that you think you will ever need to ensure, as Mitchelkitman
says, it is all from the same batch.
I ran short of BRG and the small tin of top up paint was a different shade.
So I had to buy another large batch of paint to ensure the top coat was all the same colour.
Good luck, Paul.