Originally Posted by
Simon Barden
A random orbital sander is normally fine, a straight rotary one will tend to leave marks. This is where you find that you should have used at least one more coat of grain filler, as it makes this part so much easier. Something to remember for your next kit!
You can either go the whole way back, or you can build on what you've already done and sand back until you are almost back to the bare wood, and then spray more blue over the top, and use the existing paint to help fill the grain lines. Then sand back to a similar state and respray. Repeat this until you get to a flat surface with a uniform colour and you're then ready for the clearcoat.