No where on the packaging does it say this, and i have several different coloured spray from
GW, the corvex white and the gold have the same can just different colours on the front, also
GW customer service didnt question this, also i have a
tyranid army done in zandry dust that came out fine without primer. You get a stronger bond but all the
GW sprays coloured or not seem to have good tooth and coverage.
But anyways im aware of the effect layering paint has and yes i did spray the models black first as i wished for a rich gold, i also allowed the solvent to fully degas before applying the gold just in case, not that this normally matters as my
SM are all based black the half white with only mixing time between sprays any they are fine.
This has no effect on the issue I stated.
Thank you for your input though.
I will email
GW to clarify this
EDIT:
Ok So
GW got back to me already
Quote to be fair: ''The new gold spray can be applied straight to the plastic''
They go on to say you will get a different effects by spraying other colours first but i believe this is more in the spirit of changing the tone.