What about using a product containing wax (obenaufs or black rock??? to make them a bit less slippery?
FABULOUS JOB...beautiful bag! I have one that was originally light tan that I vinegarooned and ultimately Minwaxed to black (http://forum.purseblog.com/coach/coach-rehab-and-rescue-club-624452-191.html#post21841590). Hyacinth called it a Soho Shoulder Pouch #4025. I love mine, but the drawstrings are now so slick, they won't stay put! Any suggestions on how to remedy that?