The finished product ready to accept 58mm
The epoxy will be a soft goop but shouldn't run. Make sure its as close to a 1:1 ratio. Now apply the epoxy with a disposable blade or a credit card to the male thread of the spacer. Apply a small amount to the inner thread of the filter. Be careful not to get any on the inner thread of the spacer and the rear thread of the filter. Use a stable surface to put the two together. Press and turn to even it out.
Epoxy will probably be spilling out the inside and the side. Use a blade or credit card to scrape the excess out. If any get on a thread, use a wet towelette or your fingers to wipe (make sure you wash your hands before eating!). On a stable flat surface, hold the assembly to the light to make sure they are lined up. Cleaning may protrude part of the filter outside of the spacer's ring. Just push slightly in whatever direction to adjust.
Set the assembly aside in a warm undisturbed place overnight. After the setting time has elapsed it's ready.