we use size A thread, on my bass rods, i think it makes the wraps look better. i have used pro kote, and flexcote, that would be a personal preference, flexcote dried a bit quicker at the end. on the first rod i used nylon thread and when i did the epoxy. it darkened alot, burgundy is almost black now, so if you want the color to stay true, i think you should use a NCP or color fast thread. just my opinions