Mica adds natural glimmer, similar to a metallic-flake paint on cars. That’s due to the natural mineral flakes in mica, which have light-reflecting properties. You can use mica powder for just about any epoxy project. Whether you’re working on deep-pour river tables, or smaller resin-casting projects like coasters or resin jewellery, mica adds a burst of vibrant colour and a shimmering, glowing effect.