KKay -
How much thread do you need?
I make my own sails and canvass work, etc.
If you need just a small amount, just send me a 2-3 bobbins from your sewing machine and I will fill them with what you want: PTFE/Tenara (dark), V92, V69 .....
contact me at RhmpL33ATattDOTnet
If you intend to hand-sew this - dont; but rather, simply slightly open the seam and 'slide in' a thin application of '3M fast cure 5200' --- will be more permanent and stronger than sewing. Just use masking tape where you 'dont' want it. http://www.sailrite.com/3M-Adhesive-Fast-Cure-White-5200