Try this, it will give you a good starting point: https://www.goldenpaints.com/mixer

By screen-grabbing an area from your photo I got RGB of 20 / 49 / 143 and it suggests their ultramarine blue with a bit of titan buff (using "High Flow" colours).

blue is a primary color. So, no amount of mixing is going to make it more blue. For that reason I have several blues, reds and yellows.
That said, you look close to a Cobalt Blue.
You don't need to limit yourself to gloss offerings. You can get a clear gloss to put over any color to make it gloss.

Mixing the blues together to get closer to the blue you want is the best bet.
While the theory that adding white will lighten and adding black will darken sounds solid it doesn’t actually work that way on many colors.
As a painter we would tint with similar colors to get the desired shades. So on a blue if you want to darken add a darker blue. If it needs to be more purple add some red.Greener add a little yellow and on and on.
There is an art to it that is hard to convey but don’t get lost in the simplicity of black and white.

I match only using primaries. I find that most colors need yellow added as they get old. I also use a pallette and try a small amount in varying degrees before mixing in any quantity. Patience and you can match any color to be unnoticeable.

most of those blues that you would find at michaels already have some other primary color mixed into them, this is why when you tint with white or mix with other hue of blue you get something unexpected - sometimes greenish, sometimes reddish, seldom just a darker shade or lighter tint of blue

tough to mix with those

You could go to Lowe's or Home Depot or Walmart and grab a handful of paint color chips. Take them home and find the one that matches as close as you can find. Both Lowes and Home Depot will make you a sample size container for around $3.00.

I remember reading on pinside where some one carted in his back box and got color match that way.

Or you could get this http://www.pinballuniverse.com/PinballPaints.htm

Often those cheap paints from Michael's don't have very much pigment in them as that is the expensive part of paint. This is especially true with yellows and oranges and they aren't bright enough orbsre too transparent. No amount of white or black will make a color richer, you often need a paint with more pigment load. Blue isn't as expensive to make though so you can often get a good one for less.

Yes. Completely agree. In my opinion Createx is the lowest quality that is acceptable and what I use. There are better brands available however.