Chief. I have used Coronado Premium Outdoor Latex. Also Valspar makes a premium outdoor oil base I have used as well.
Both have held up well. I think the Coronado maybe a little better.
Coronado used to be the old Negley Paints made in SA. Product called Crylycoat.
Don't know if it still available through Coronado.
Supposedly Sherwin Williams makes the same type of product.
Just get the high end paint if you want it to last.
I repainted 10 blinds with the Coronado and it has held up well for the last 5 years.