Fibreglass tape ia a handy product for small fibreglass repairs, reinforcing seams and many other purposes.
This fibreglass tape is is available in widths from 38mm through to 150mm and is sold by the metre (from 50 metre rolls).
There is no minimum order size. Discounts are automatically applied to orders of 50 metres or more of the same width.
I'm using this tape in the construction of a radio controlled glider. Works like a charm