Practical, no doubt, but pretty unsporting, especially when it’s possible to cast custom lenses at home using silicone molds and epoxy resins ... that an inexpensive glass or plastic lens ...

EP30-2 cures at room temperature or more rapidly at elevated temperatures. This epoxy flows smoothly and evenly after mixing, and is easily applied as an adhesive, coating or potting material.

Since a simple difunctional epoxy resin already acts as a tetrafunctional reactant, this combination can lead to extremely high crosslink densities, resulting in outstanding dielectric properties, ...