Not much of a rod builder, but I have used a small dab of UV resin to fill a small gap on a rod and it seems to have worked ok. Note that there are a variety of UV resins out there with different properties. Solarez, for example, as "thick", "thin", "ultra thin" and "flex" formulas available. The flex formula is being useable for wader repair. See http://solarez.com/fly-tie-fishing/