RE: Epoxy Polyamide Paint
Bluetide, As a commercial pilot 30 years in the business, I can tell you about epoxy polyamide. Aluminum airframes of both fixed wing and rotary wing (helicopters) used zinc chromate as a primer for decades back to the early years in aviation. Zinc, however, as in zinc chromate has been over regulated by the government as in MSDS and is no longer used. What aircraft manufacturers use today to prime aircraft grade aluminum is epoxy polyamide. It looks the same as zinc chromate, lime green, and it accepts any two part poly urethane topcoat readily. Imron is one paint that is used quite a bit on jets...speeds of 600 miles an hour, a paint needs to stick!
So, guess what I used to coat my two 155 gallon alumimum tanks on my sportfish??