Originally Posted by
Jicafold
I am sure we all know that. But I'll be sure to take primed sample tube to the store and do a test spray in the isle.

What I am saying is that it at least is worth taking a look at.
I am not suggesting that, I am stating that opaque paint is not that opaque. Often the primer effects the final tone.
the cost of a spray can is noticeable, but not so outrageous as to not purchase and assess at home.
as an example, paint the same color over, white, grey primer and red oxide and there will be different results.
Ferrari restorers have been known to prime the Ferrari red with a pink primer surfacer to match the original as seen on the F40.