Yes, you can pour table top epoxy over casting resin, but there are important steps and considerations to ensure a good bond and a smooth finish:

Here’s how to do it effectively:

1. Partial Curing (Option 1): Allow the casting resin layer to cure to a hard & tacky state, we often refer to this as bar-room-floor tacky. The exact time for this partial cure will depend on the epoxy type and environmental conditions.
2. Fully Curing (Option 2): Allow the layer of casting resin to fully harden, followed by a light scuffing with around 220 grit sandpaper and a proper wipe down with Superclean Epoxy Cleaner to ensure a mechanical bond between layers.
3. Apply Table Top Epoxy: Mix the table top epoxy according to the manufacturer’s instructions and pour it over the sanded casting resin surface. Table top epoxy is generally self-leveling, which helps to create a smooth, even surface.
4. Remove Bubbles: After pouring, use a heat gun or a torch to remove any air bubbles that rise to the surface.
5. Cure Again: Allow the table top epoxy to cure fully. The time required for this will depend on the product specifications.
6. Finishing Touches: Once cured, you may sand or polish the surface if needed for the desired finish.

By following these steps, you can successfully layer table top epoxy over casting resin, often used in projects like encapsulated objects or river tables to create a final smooth and glossy surface.