I use only Plasticote primer, mostly the grey but I a can of white, black, and red around just in case. I also keep a supply of white plastic spoons around - some are half HOK silver and half gold. Other spoons are primed with the Plasticote grey, white, & black. All I have to do is spray a color coat over a spoon to see the effect on different primer colors. The gold/silver spoon is for HOK candies.