I never prime parts other then body
I dont worry to much about painting areas of the kit that wont be seen, you know like, the insides of the body, top side of the chassis, underneath the seats, stuff like that, why waste paint .
I like to sit on the floor with my builds and go vroom! vroom ! with them lol
I too have often thought about blowing up some of my builds
I will never be a collector, I will just have more kits then I have time to build