COLOR 3i proposed an aircraft-type epoxy primer which has been designed to adhere directly to aluminum without any chemical treatment.
In addition, this primer provides an anticorrosive performance (ASTM B -177) of 3000 hours at 0.5 mil dry which is required by Bombardier and other aircraft manufacturers.
For an ambulance, we determined that an average thickness of 1.2 mil dry was needed, which resulted in a salt spray test over 5,000 hours.