As it is a matt surface in the end, some gentle sanding can help. Don't apply too much pressure, as a sand through is even more work.
Prevention is better. Thin your paint a bit more, even the Tamiya xf stuff. Airbrushing is a delicate art, pressure, thinning, temperature, humidity and distance to the model are variables. And then there's needle size as well.
When you have the paint in your cup, spray some on a spare piece of plastic, disposable spoons are very handy. Better to waste a bit of paint on a spoon, then to have to strip a kit and start over. Sometimes starting over is the last option, don't hesitate to use that option.
And armor has the added bonus of mild to heavy weathering to hide mistakes 😉
18. July, 17:33