3M's blue tape is what you want to use. It won't bleed and is very thin.
The graphics on this Buick were masked using it.
There is no tape edge what-so-ever and the tape leaves a very sharp edge. If you can't find the Tamiya tape the 3M Fine-Line will work just as well and it is available at any bodyshop supply outlet.
Mark@MAS
www.mas-parts.com