Ed I also coat with magic marker or nail polish. I actually try to color coordinate the coating w/overwraps if any bleed occurs . Different color markers or polish. A light coat of CP over marker helps(I think). Never had any issues with rust. Encapsulating the guide feet w/ epoxy should keep intrusion of air /water. Only concern may be when the epoxy cracks around foot. I think slimming the feet help . Putting a smooth ramp of thread w/o an edge on the transition. IMO
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