If you just talking about the fasteners, any good caulk will work, Polysulfide, polyurethane
, or butyl. Cover the screw threads and fitting base and install making sure caulk squeezes out all around. The rout out the core and fill with epoxy
routine is for fasteners that take a load. The epoxy sals core and is a solid non compressible core so you can't crush the balsa. Doesn't hurt to do it but it's a time consuming process. Just Epoxying the core with a resin soaked Q tip would be enough protection for wire glands.