Help with Fluorescent Colours

[Dhami1]

Hi chaps.. i need a bit of help with flu colurs. here is what im using;

Iwata HP-CS airbrush - 0.35mm needle
Ripmax Silent compressor
Patrca Acrylic Paints

And here is my shell;



The problem im having with is the flu colour in the middle, its a mix of flu red and orange..(still not found the right colour.. a bit too pink)

everytime i spay the flu colour it doesnt seem to set right, and has a very coarse feeling on the shell. Its like the paint has set before it has even reached the shell, its causing the flu colour very suseptable to cracking.. what am i doing wrong? ive tried diluting the paint with a bit of acylic thinner..but no different

any help will be appreciated..

thanks
gurdeep