Hunter,
You wanted to know, "How long does our polish jobs last?' After completion of Polish job, instructions are given - verbally, written and ON Trailer Demo - on, "How to take care of your Airstreams new finish."
IF the customer listens & does per instructions (Maintenance is NOT difficult NOR time consuming!), Airmark Aircraft-Airstream Detailing(tm) - Polish Job - WILL outlast Airstreams clear coating! PLUS you won't every have to worry about, "Filiform Corrosion"!
Supershine Jim