Alternative for painting side repeaters...

I saw these sometime ago but actually purchased one today coz they were half price. They are pens for decorative glass art and are acrylic based, it goes on quite thickly which may be because its new but u can then go over it with a brush to even it out. There are also a few more colours available so u could replicate those custom lenses that are available. It cost me £1.35 from Focus D.I.Y - for those in UK!
http://files.automotiveforums.com/uploads/846864pen.jpg