Engine Paint Question

Painting my stuff today and am using the Dupli-Color enamel. I'm using the primer first and am wondering when I should apply the actual paint?

Should I let the primer sit for the 7 days it says it needs to cure then paint or should I lay the paint on after 10min?

It says to put 2 light coats and one med coat. Each coat 10 minutes between and all within an hour.

Thanks!