Boat numbers

I have a two man (made of the plastic stuff) and am needing to redo my numbers. Being a plastic type boat, the vinyl letters always starting peeling off / wash off when washing. I am looking for alternatives / ideas.

I was considering buying stencils and painting the numbers on. Has anyone ever done this on this particular material?

I would really like specifics on the best paint for this if anyone has any experience, thanks.