I made a big mistake! I didn't test the position of the green circles before airbrushing the logos and when I did it... the logos were touching the circles....
So I decided to sand the logos and start again using the tyre logos decals instead of airbrushing them. The fisrt step was a first layer of gloss clear.
Then I started decalling the circles and the logos. Finally I airbrushed another layer of gloss clear, two layers of matt clear and finally I airbrushed a very thin layer of smoke+matt black to tone done the shinning.