Mix equal parts of resin and hardener in a clean measuring cup. Stir for 2 minutes then transfer into a second clean measuring cup. Stir with a clean stir stick for another minute.
Distribute the mixed resin evenly across the six lids. Tip the lids as needed to make sure it gets into the edges of the lids.
After 10-15 minutes blow off any air bubbles rising to the surface of the resin using a straw or small kitchen torch. Repeat as necessary over the next 1-2 hours.
Place the lids on a level surface and cover to keep dust from settling in. Leave to cure overnight (24 hours for a soft cure, 72 hours for full cure).