Best way to paint plastic?

[Deja Q]

Today I bought a pair of sunglasses for a costume. I'd checked everywhere else and found nothing similar or as gothic looking. The frame is chrome, with dark lenses. Surrounding the lens is a gray round piece extending over and around the lens.

I want to paint this gray portion black.

The lenses can't be removed and they help hold the gray round piece in place.

Should I try painting them and, if so, what is the best method?

Thanks!

[Philostopher]

1. Hobby enamel might work.

The stuff they make for painting plastic model cars and planes. It's definitely designed to paint plastic surfaces.

[NoPasaran]

2. I'd mask the lenses and use spray paint.

Do it soon so by tomorrow the fumes won't be so strong.

[BiggJawn]

3. Use a black marker, like a sharpie or El Marko...

Quick, black, and cheap.

[chrisesq]

4. Scuff up the surface with fine grit sandpaper

Otherwise it will just flake off.

[Military Brat]

5. Check your local hardware store

There's a new kind of spray paint available which will paint plastic. Works like a charm.

[DuctapeFatwa]

6. black nail polish

unless you are allergic to it