yea 50/50 is far too much, normally you can get away with a couple of drops of water/ reducer. Ive used water many times before however reducer definitely is better gives a much smoother spray but water does work fine.
I agree with the above post, you apply paint alot thinner when airbrushing which is why the black is dulling the finish, like suggested back with white if possible, I personally use plasticote super clear for the backing.
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