2 simple painting questions

[RacinSkillZ101]

i painted an eclipse body and while doin some details i required to clean up a mistake, to remove the unwanted paint i used nail polish remover, but now theirs a giant white fog on my door! what should i do to fix this, clear coat?

if i wanted to acheive this color below on the 350z body, could i use duplicolor metalcast orange over the stock 350z paint, or would i have to base the car with a silver first?

thanks for your time.