I have never used a rattlecan on a model (I'm really a ship modeler). I decided to try Steve Guthmiller's spray everything in one go technique on the Revell XKE coupe which is molded in red. I was able to get duplicolor dark blue pearl 8P4 ( a Toyota color but close enough for this project) and duplicolor 1K clear, but they did not have Duplicolor primer, so I took what was available which is Rustoleum Primer-Sealer 249321. I especially wanted the sealer feature due to the red plastic, altho bleed thru is probably not a major problem with dark blue paint.
My first pass on the hood resulted in some runs, even tho I tried to make a very quick pass both starting and ending off the model. I did all of the red parts with 3 coats and decided to stop there, let it dry, and sand out the runs on the hood (tho they self-leveled to an amazing degree). I found the learning curve for spray cans is very quick and after a few passes I could do fairly light coats.
The reason I am posting this is to let everybody know that this Rustoleum primer after 48 hrs. has NOT resulted in any damage to the plastic, even with my unintentional very heavy first coat. I also tested the primer on the cream colored sprue for the interior with no damage.
Thanks, John