https://www.amazon.com/Tamiya-Models...ds=tamiya+blue
The actual color you want might be a mix between the above sky blue and a regular blue
https://www.amazon.com/dp/B0099WQ0YU..._t1_B0099WPS5C
If you have a decent hobby shop locally (not Hobby Lobby), you should be able to find these paints for under $3 each.
test the color on some piece of plastic first just to make sure how it looks when it fully cures. If it's close, that's all you need. It's such a small spot that it will disappear over the distance of a few feet away.
From my experience of doing a touch up, you'll still fixate on it for a little while, but in time you'll completely ignore it. Even though you know it's there, it won't jump out at you like the bare statue exposed does. After a while you won't notice it and no longer think about it.
But if you aren't comfortable, no problem.