The best way to reduce microphonics in a pickup is to make sure the components inside the pickup are firmly secure and I believe in using a warm soft wax potting to help reduce unwanted feedback from the pickup. The wax helps reduce mechanical vibrations and gaps within the components. I don’t believe in potting or encapsulating pickups and especially vintage pickups in a epoxy solution. Epoxy potting is permanent and future repair or modification can be extremely difficult if not possible. Extreme care and safety should be taken when wax potting pickups. The vapor from the wax is extremely flammable and proper procedures should be followed.