Little Windows Brilliant Resin layers beautifully and seamlessly. You can pour thin or thick layers to add embellishment, and create dimension and 3D effects. Allow your resin to set up 3-6 hours between layers, depending on the weight of what you're adding to the next layer. Example: if adding heavy metal charms to the layer, let previous layer set up for about 6 hours so the charm doesn't push down into the layer below. If adding lightweight elements, 3 hours should be fine.
Here's a basic How-To Video for Layering: