I underwrap anything used for stripers . 7 ft on up. All boat rods . I rarely coat underwraps before wrapping the overwrap. I feel it bonds both wraps together. Never had a problem with all the rods I've wrapped. Mainly it make the underwrap smooth so that the overwrap thread doesn't slip into the underwrap. Good rule of thumb has been size A underwrap thread and size D overwrap. Hope this helps
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