You could use the outline webGL effect. You'll have to get it from this topic and put it in your installation folder.
See attached capx for an example...
Now, if the effect you after is a blurred additive glow, you'll have to use a different sprite on top of the spaceships and set its blend mode to additive.
See the following capx...
You can use glow mask on photoshop.
2 mask's on in 100 opacity and the other 80 opacity.
I think i got it guys, you gave me an idea, since i can´t use photoshop i decided to use Gimp (which is similar) and i found a neon effect so i made a neon version of the sprite (the outline) and placed the normal sprite on top of it. Now i just need to adjust some values.
Thanks a lot for the help!