Good suggestion on the 3M tape Aaron, which has reminded me of another type of tape. The Graphics industry used to use some very fine tapes, in various widths, from as small as 1mm, possibly smaller, for drafting and PCB design. These are flexible, and can follow fairly sharp compound curves, and are ideal for line work, stripes, multiple stripes and, especially, spinner spirals. They aren't cheap, but by modelling materials standards not too expensive, and come in rolls of from (IIRC) 10 meteres upwards.
I don't know if the company is still in existance in the UK and the USA, but IGM were a major supplier. Might be worthwhile checking with a Graphic Arts/Printing supplies outlet.