Here is a description of a permanent sharpies marker sold at Home Depot.
The Sharpie Magnum is an industrial strength permanent marker that can be used on wet and oily surfaces. This marker has a durable aluminum barrel and a felt tip. It is suitable for use on concrete, stone, tile, brick and metal.
I don't see why not!
The sun fades them out quickly. Know by experience.
You may want to spray with polyurethane when finished.