External herbie overflow.. glass thickness?

[JDigital]

Thanks sphelps. Just what I was looking for.

I called Speedy Glass this morning, and they mentioned 5-6mm glass and I didn't think that would be thick enough so they told me to call other places... Now I need to call back..

[sphelps]

If you're buying new you might as well use 6mm, it'll be easy to find and about the same price as the 5mm. Plus it's closer to 1/4" if you prefer to work with inches.