If you've spent much time around ships, you might have noticed they're often painted red just below the water line. What's the reasoning behind this?

New England settlers didn't have enough money to paint their farms. So they needed a cheap way to protect the barns' wood. They mixed skimmed milk, lime, and red iron oxide to make a red ...

Begin by painting the metal with red oxide paint to prevent it rusting. Once the surface is dry, you can apply a primer or go straight to painting. You can use brushes or aerosol sprays.