Spray Paint Yellow

I am having a few probs with the yellow paint. I found one that is a pretty close match the the yellow colour here in Australia but it wants to crack and craze. It worked ok for the body armour as most of it will be covered in the green but having issues on the left shoulder.
I was hoping that someone would have an idea on a yellow Tamiya paint colour I can use.
At first look without testing it I am thinking Tamiya Flat Yellow or Tamiya Chrome Yellow. If anyone has done a test or knows which would be better suited I would love to hear from you.
Cheers
Steve

What kind of paint are you having the cracking/crazing problems with? Enamel? Lacquer?

What are you spraying it over? Bare plastic? Primer?

Might be able to make some suggestions with more info.