oh yeah, good idea! da9's are fun cars, keep the original spirit alive lols.

Anyway back on topic:

Your scared to paint haha, your funny.
Just remember as said above, there are primers for plastics too, if you use just any normal primer it will most likely peel off. As for the vht vinyl dye that should be used for your interior vinyl trim only. If you want to do the plastics just use the plastic primer and vht interior spray. There are other brands out there but for now go with what you know. It is not imperative that you use primer its just that the result and effect will last much longer and will look better.

Also dont forget to wear a respiratory mask when painting. Paint is very bad for you! I recommend spraying indoors in your garage so you wont get dirt or small insects getting blown onto your freshly painted work. Just leave the doors and windows open and you can also pour into bowls some "brown vinegar" this will absorb the fumes and neutralize the air, only if you really cant stand it and want to get rid of the smell before your dad comes home lol.