I would advice people to be a little bit more adventurous when it comes to colours. If you know what colour you want to get, and don\'t have any pre-mixed colour that fits the bill, try to mix something yourself. It\'s usually not that difficult, especially if you can find colours that are quite close, that only needs tweaking a bit. Getting a better understanding of colours and how to mix them to get what you want is infinitely useful. Just imagine what you\'d do the day you find something in real life you want to mimic, and you can\'t simply ask another painter what colours he/she used. Or you have an image in your head that you want to portray in miniature... you can\'t ask people how to mix paints to match colours you only have in your mind.
Don\'t be afraid to play around with colours and try different things. Be as bold and crazy as you want! If it works you\'ve learned something useful, and if it doesn\'t work, you\'ve still learned something. And you can always re-paint the area with something you feel more comfortable with, if the experiment isn\'t that successful.
Most of the time, the EXACT paint recipe isn\'t that important to achieve a certain effect. There\'s many, many ways to achieve that blue colour of the sentinel, for instance, or something close enough.