those are pissa!!!
scuff them up with a gold skuff pad,spray them with adhesion promoter and pour two part eurethane clear all over them. they'll hold up to anything.
I'm not familiar with that stuff but if you are I am willing to send you a few. Can you apply it over the powder paint or any paint for that matter or just to the raw aluminum. I'll send a couple for you and a couple for me . Paul