It's taken me over two years now, but through trial and error I've realised that Vallejo paints seem to work better in general when used as sparingly as possible and in multiple thin layers. They also work best when just slightly thinned with water. I used to think water was bad to use with them, and over the years I have tried both a medium that was supposed to keep them wet longer (but found it had more propensity to leave brush streaks), as well as an airbrush thinner (which dried quickly but also didn't work well on plastic as the alcohol in it had a tendency to remove the underlying layers of paint), and honestly nothing beats just water. (Though I use de-ionised water since the water in my taps leaves limescale marks.)
No idea what to do about the shine when using only brush-on paints. You could probably get rid of it by spraying Mr. Super Clear or some equivalent, but that stuff is toxic and I don't dare work with it even with a mask on.
And regarding the paint scratching off.... eep. The only thing I can think of would be to use a primer first before applying the paint (though maybe you already did that).
ETA: Sorry to derail your thread, Kayla...
No idea what to do about the shine when using only brush-on paints. You could probably get rid of it by spraying Mr. Super Clear or some equivalent, but that stuff is toxic and I don't dare work with it even with a mask on.
And regarding the paint scratching off.... eep. The only thing I can think of would be to use a primer first before applying the paint (though maybe you already did that).
ETA: Sorry to derail your thread, Kayla...