It has been my understanding that, on Precept and Alante product lines, Jayco won't do ANYTHING that isn't on their published list of options. But that shouldn't prevent you from attempting to get a full-body-paint quote from the outside supplier who does that for the Precepts. My 2014 Melbourne had a sticker inside a cabinet door that identified who that was. At that time, MSRP for the paint option was $5000. Now on Precept price list it has ballooned to an eye-popping $12,500. I think it's safe to conclude that Jayco doesn't want to mess with full-body-paint, especially on their entry level (and price sensitive) coach.
I was surprised when my wife said that she wanted the paint option on our 2017 Precept and thought it was worth the extra cost. Dealers haven't been charging the full $12,500 price premium; nowhere close.