The information Peter gave is right.
The issue with OSC cameras and the addition of NB filters is the loss of resolution, you have RGGB and most of the NB data lays in R and B so effectively your loosing 3/4s of your resolution
This doesn't mean it wont work, because it does. Just it doesn't work 3/4s as good as a mono CCD.
Stick with your sky glow and contrast increasing filters for now and save your roubles for a mono if you get frisky enough to get deeper into astrophotography