When I made jointed swimbaits, I used D2T on the inside faces of the joint, and brought it out 1/4" onto the sides of the pieces. Then I coated with E tex, two coats, turned 8 hours each. I let the epoxy cure a couple of days, and they swam fine.
I did wind up softening the edges of the front part of each section, so there wasn't a sharp corner. I just rounded it slightly on my oscillating belt sander. I found that kept the joints from sticking on the cast, when the baits landed tail first.