Some ceramic coatings are only meant for paint. That question would have to be a question to the company where you purchased the ceramic coating from. They should be able to answer this.
Our Plastic Restorer being applied or not, would have no effect on the ceramic coating manufacturers answer.
If they say it's okay to apply their ceramic coating to plastic, then yes you can apply it.
If they say it's not okay to apply the ceramic coating to plastic, then no, you shouldn't apply it.