Painting question - Orange

I tried to paint an orange base coat on a starship figure last night.
I had primed it with white.  Ral Partha Orange was very thin and I
wasn't terribly happy with the first coat's results.  I also tried
an old bottle of Citadel Hobgoblin Orange and the results were even 
worse.

Are there any suggestions for better coverage or a primer base color
that would do a better job for a one coat layer of orane base?

Thanks,

Jon