The honest answer with Melbourne-specific data — from Savvy at Shelby Ceramic Coating, Vermont VIC 3133.
A professional Shelby ceramic coating lasts:
Melbourne regularly reaches UV Index 10–12+ in summer — significantly higher than most European and North American cities where many coating durability claims originate. Combined with acidic rain and temperature swings from 40°C to sub-10°C, Melbourne is one of the harshest environments for automotive paint in the world.
Layers: Essential (1 layer) = 2–3yr · Premium (2 layers) = 3–5yr · Ultimate (3 layers) = 5–7yr+.
Washing: Automated car washes are the single biggest factor shortening ceramic coating life. pH-neutral soap and a microfibre mitt is essential.
Parking: A garaged car will retain coating significantly longer than one exposed to sun and rain 24/7.
22/198 Rooks Road, Vermont — servicing all eastern Melbourne suburbs.