A lot of people use plastic spoons for testing spray paint on. You can't hardly get those anymore in Australia: everything is eco-responsible bamboo. But I found herb garden plastic stakes at the dollar store that work well for testing.
Do 10 of them with your primer
Then 9 with your spray putty (or whatever)
Then 8 with your next coat (silver)
Then 7 with your ... black
You get the idea. You create a record of what every stage looks like in order.
You also do the same thing with combinations you're testing.
Primer A - with black A
Primer A - with black B
Primer A - with black c
etc etc.
Then you take all those and test them with Clear A, Clear B, Clear C
Then you test with Tape A, Tape B, Tape C
And all this testing gets you real results in your climate, with the paint+tape available to you at your stores, with whatever type of putty you used and so on. Its just so many combinations that nobody can tell you what recipe to follow. And this gives you a feel, an understanding of the paints... the techniques... distances from can to part... how paint B reacts if its a little cold out... Its an art you learn.
Type up some paper labels for the back
And you can even toss them in the box/tray/shelf with the part and highlight what stage they are on so you don't forget after a week or two.