The other thing that I would consider when using straight enamel is the color because it will fade.
They will all get lighter looking but some actually change in color, especially the colors with red pigment in them.
I've got 3 things which have been outside 24/7 since 1995
Red trailer- faded to a dusty pink look
Gas pump - Blk and yellow, dusty looking but still black and yel.
Street lamp - Mauve color, dusty looking, but turning gray.
I got to say, I'm pleased with the endurance of the paint and maybe if I had washed these items more than once every 3 years they wouldn't look so dusty.
If ya wash the oxidized paint off the color will stay looking better.
Dan
