How can I paint numbers on a mailbox?

Hello. I used white acrylic paints and seal them on with a poly acrylic sealer. An oil base paint pen might be another alternative

Lucy: Lucy -- you can buy number stencils from Michaels or Hobby Lobby

You can buy adhesive numbers and letters that will adhere to your mailbox! Available at hardware stores and any big box store like Menards or WalMart! No painting at all!

They adhere well and don't come off for years!

You can stencil it or go for it free hand style! Depending on it's location, you might want to ensure its easy to see by doing a different color border around for first responders to easily see it.